delivered the opinion of the Court.
The question for decision in this case is whether the provision of § 22 of the 1950 Organic Act of Guam that the District Court of Guam “shall have such appellate jurisdiction as the [Guam] legislature may determine” authorizes the Legislature of Guam to divest the appellate jurisdiction of the District Court under the Act to hear appeals from local Guam courts, and to transfer that jurisdiction to the Supreme Court of Guam, newly created by the Guam Legislature.
I
Section 22 (a) of the Organic Act, 64 Stat. 389, before an amendment not relevant here, provided:
“There is hereby created a court of record to be designated the 'District Court of Guam/ and the judicial authority of Guam shall be vested in the District Court of Guam and in such court or courts as may have been or may hereafter be established by the laws of Guam. The District Court of Guam shall have, in all causes arising under the laws of the United States, the jurisdiction of a district court of the United States as such court is defined in section 451 of title 28, United States Code, and shall have original jurisdiction in all other causes in Guam, jurisdiction over which has not been transferred by the legislature to other court or courts established by it, and shall have such appellate jurisdiction as the legislature may determine. The jurisdiction of and the procedure in the courts of Guam other than the District Court of Guam shall be prescribed by the laws of Guam.” 1 (Emphasis supplied.)
*197In 1951, under the authority of the Organic Act, the Guam Legislature created three local courts for local matters and defined cases appealable from those courts to the District Court.2 That structure continued without substantial change for 23 years until 1974 when the Guam Legislature adopted the Court Reorganization Act of 1974. Guam Pub. L. 12-85. The former Island, Police, and Commissioners’ Courts, were replaced by a Guam Superior Court with "original jurisdiction in all cases arising under the laws of Guam, civil or criminal, in law or equity, regardless of the amount in controversy, except for causes arising under the Constitution, treaties, laws of the United States and any matter involving the Guam Territorial Income Tax.” 3 The Act also repealed the provisions of the Guam Code of Civil Procedure governing appeals to the District Court,4 and created the Supreme Court of *198Guam. The Act transferred to the Supreme Court essentially the same appellate jurisdiction as had previously been exercised by the District Court, providing that the Supreme Court “shall have jurisdiction of appeals from the judgments, orders and decrees of the Superior Court in criminal cases . . . and in civil causes.” Pub. L. 12-85, § 3. Other provisions of the Reorganization Act amended various territorial laws to change the references to the Supreme Court of Guam from the Appellate Division of the District Court as the appellate court.
Respondent was convicted of criminal charges in the Superior Court, and appealed to the District Court of Guam. The District Court dismissed the appeal on the authority of a divided panel decision of the Court of Appeals for the Ninth Circuit holding that the 1974 Court Reorganization Act validly divested the District Court of its appellate jurisdiction and transferred that jurisdiction to the newly created Supreme Court. Agana Bay Dev. Co. (Hong Kong) Ltd. v. Supreme Court of Guam, 529 F. 2d 952 (1976). In this case, however, the Court of Appeals for the Ninth Circuit, overruled en banc 5 the panel decision in Agana Bay, and reversed the dismissal of respondent's appeal. 540 F. 2d 1011 (1976). The Court of Appeals held that “the appellate jurisdiction of the district court may not be transferred without congressional authorization and pursuant to such provisions and safeguards as Congress may provide.” Id., at 1012. Certain judgments of the appellate division of the District Court were made appealable to the Court of Appeals for the Ninth Circuit, and to this Court, by § 23 of the Organic Act of Guam of 1950, as *199amended, 65 Stat. 726,6 but Congress has not similarly provided for appeals from judgments of the Supreme Court of Guam. In that circumstance, the Court of Appeals held that § 22 (a) did not authorize the transfer of the District Court's appellate jurisdiction to the Supreme Court of Guam because, under existing statutes “litigation in the territorial court [that] may involve substantial federal questions . . . cannot be reviewed by the United States Supreme Court or by any other Article III court ...” 540 F. 2d, at 1012. We granted certiorari, 429 U. S. 959 (1976). We affirm.
II
We emphasize at the outset that the 1974 Court Reorganization Act in no respect affects the exclusive7 original federal-*200question jurisdiction of the District Court granted by the first clause of the second sentence of §22 (a), which now provides that the “District Court of Guam shall have the jurisdiction of a district court of the United States in all causes arising under the constitution, treaties, and laws of the United States . . . 48 U. S. C. § 1424 (a). Decisions in such cases brought in the District Court are appealable to the Court of Appeals for the Ninth Circuit or to this Court.8 The question presented for decision here rather concerns appeals to the District Court from decisions of local courts in cases arising under local law. The language we must construe immediately follows in the same sentence, providing that the District Court “shall have original jurisdiction in all other causes in Guam, jurisdiction over which has not been transferred by the legislature to other court or courts established by it, and shall have such appellate jurisdiction as the legislature may determine.” (Emphasis supplied.)
We first observe that Congress used different language in its grant of power to the Guam Legislature over the District Court’s original jurisdiction from its grant of power over that court’s appellate jurisdiction. The Act expressly provides that original jurisdiction might be “transferred” to “other court or courts” created by the legislature. As to appellate jurisdiction, however, the wording is that the District Court “shall have such appellate jurisdiction as the legislature may determine.” The question immediately arises why, if Congress contemplated authority to eliminate the District Court’s appellate jurisdiction by transferring it to a local court, Congress did not, as in the case of “original jurisdiction,” explicitly provide that appellate jurisdiction too might be “transferred.” Moreover, if Congress contemplated such a broad grant of •authority, it might be expected that it would have referred, as in the case of original jurisdiction, to “other court or courts” that would be established to assume the appellate jurisdiction *201transferred from the District Court. Clearly, the word “determine” is not used as a synonym for “transfer,” and it is not obvious that the power to “determine” the appellate jurisdiction of the District Court includes the power to abolish it by “transfer” to another court. We fully agree with Judge Kennedy dissenting in Agana Bay, 529 F. 2d, at 959, that Congress used “determine” because Congress “more likely intended to permit the local legislature to decide what cases were serious enough to be appealable,” and we note that the Guam Legislature found no broader authority in the term for the 23 years from 1951 to 1974. We therefore conclude that Congress expressly authorized a “transfer” of the District Court’s original jurisdiction but withheld a like power respecting the court’s appellate jurisdiction, empowering Guam to “determine” the District Court’s appellate jurisdiction only in the sense of the selection of what should constitute appealable causes.9
Other considerations besides our reading of the bare text support the conclusion that the power to “determine” should not be construed to include the power to “transfer” without more persuasive indicia of a congressional purpose to clothe the Guam Legislature with this authority.
First, we should be reluctant without a clear signal from Congress to conclude that it intended to allow the Guam Legislature to foreclose appellate review by Art. Ill courts, including this Court, of decisions of territorial courts in cases that may turn on questions of federal law. Important federal issues can be presented in cases which do not fall within the District Court’s federal-question jurisdiction, because they do not “arise under” federal law, but instead fall within the exclusive jurisdiction vested in the Superior and Supreme Courts by the Reorganization Act. For example, criminal convic*202tions returned in the Superior Court and appealable under the Court Reorganization Act only to the Supreme Court, may be challenged as violating federal constitutional guarantees. It is no answer that rejection of a federal constitutional defense by the Guam courts, though not presently directly reviewable by the Court of Appeals for the Ninth Circuit or by this Court, may nevertheless be reviewable in federal habeas corpus. Tr. of Oral Arg. 9. Habeas corpus review has different historical roots from direct review and different jurisprudential functions and hmitations. See, e. g., Fay v. Noia, 372 U. S. 391 (1963). As respects civil cases, though the “arising under” jurisdiction vested in the District Court by § 22 (a) tracks the general federal-question statute, 28 U. S. C. § 1331 (a), clearly — whatever may be the ambiguities of the phrase “arising under” — it does not embrace all civil cases that may present questions of federal law. See, e. g., Gully v. First Nat. Bank, 299 U. S. 109 (1936); Cohen, The Broken Compass: The Requirement that a Case Arise “Directly” under Federal Law, 115 U. Pa. L. Rev. 890 (1967). We are therefore reluctant to conclude that, merely because power to “determine” may as a matter of dictionary definition include power to “transfer,” Congress intended to confer on the Guam Legislature the power to eliminate review in Art. Ill courts of all federal issues presented in cases brought in the local courts.
Second, nothing in the legislative history of the Organic Act of 1950 even remotely suggests that Congress intended by its use of the word “determine” to give the Guam Legislature the option of creating a local Supreme Court having the power of ultimate review of cases involving local matters. Rather, the legislative history points the other way. Three bills introduced in the 81st Congress provided for a judicial system for Guam. Hearings on S. 185, S. 1892, and H. R. 7273 before the Subcommittee of the Senate Committee on Interior and Insular Affairs, 81st Cong., 2d Sess., 1-25 (1950) (hereafter Hearings). All three provided for appellate review by Art. Ill *203courts of territorial court decisions. The bill that became the Organic Act, H. R. 7273, originally established a Supreme Court of Guam whose decisions were to be reviewable by the Court of Appeals for the Ninth Circuit and by this Court. Hearings 22-23. The proposal for a congressionally created Supreme Court was rejected in favor of a Federal District Court. This was done in part to provide “litigants in the Western Pacific with direct access to the federal court system.” Agana Bay Dev. Co., Ltd. v. Supreme Court of Guam, supra, at 961 (Kennedy, J., dissenting); S. Rep. No. 2109, 81st Cong., 2d Sess., 4 (1950). But another concern accounts for the provision giving the District Court jurisdiction in local matters. Our independent review of the pertinent legislative materials confirms, and we therefore adopt, Judge Kennedy’s conclusion expressed in dissent in Agana Bay, supra, at 961:
“Because of concern that there would not be sufficient federal question litigation to justify a separate district court in Guam, the court was given original jurisdiction in local matters. It was also envisioned that the district court would serve as an appellate body once local courts were established. The apparent reason for eliminating the provision for a local supreme court was to avoid duplicative judicial machinery, rather than to allow local authorities to put certain controversies beyond review by the federal court system.”
Third, if the word “determine” is to be read as giving Guam the power to transfer the District Court’s appellate jurisdiction to the Supreme Court and, by the same stroke, to authorize Guam to deny review of the court’s decisions by any Art. Ill tribunal, Congress has given Guam a power not granted any other Territory. Congress has consistently provided for appellate review by Art. Ill courts of decisions of local courts of the other Territories.10 What history there *204is points to a purpose to create a similar system for Guam. Hearings, supra; S. Rep. No. 2109, 81st Cong., 2d Sess. (1950). We are unwilling to say that Congress made an extraordinary exception in the case of Guam, at least without some clearer indication of that purpose than the word “determine" provides. Moreover, we should hesitate to attribute such a purpose to Congress since a construction that denied Guam litigants access to Art. Ill courts for appellate review of local-court decisions might present constitutional questions. See generally Hart, The Power of Congress to Limit the Jurisdiction of Federal Courts: An Exercise in Dialectic, 66 Harv. L. Rev. 1362 (1953).
Affirmed.
The “District Court of Guam” rather than “United States District Court of Guam” was chosen as the court's title, since it was created under *197Art. IV, § 3, of the Federal Constitution rather than under Art. Ill, and since § 22 vested the court with original jurisdiction to decide both local and federal-question matters. S. Rep. No. 2109, 81st Cong., 2d Sess., 12 (1950).
The local courts were the Commissioners’ Courts, the Police Court, and the Island Court. Guam Code Civ. Proe. §81-278 (1953).
The District Court was vested with a wide-ranging appellate jurisdiction respecting criminal and civil decisions of the Island Court. §§ 62, 63, 82. A single judge constituted the District Court as a trial court. However, § 65 constituted the appellate division as a court of three judges. Congress approved this measure in a 1958 amendment to § 22 of the Act, 72 Stat. 178. See Corn v. Guam Coral Co., 318 F. 2d 622, 627 (CA9 1963); letter of Judge Albert B. Maris, judicial advisor to Guam, to Chairman, Committee on Interior and Insular Affairs, House of Representatives, Mar. 14, 1957, reproduced in S. Rep. No. 1582, 85th Cong., 2d Sess., 7-9 (1958); id., at 4r-5.
The Court of Appeals for the Ninth Circuit held that the Superior Court’s original jurisdiction is exclusive and not concurrent with the District Court. Agana Bay Dev. Co. (Hong Kong) Ltd. v. Supreme Court of Guam, 529 F. 2d 952, 955 n. 4 (1976). This holding is not contested here.
The Code of Civil Procedure provisions repealed by the Court Reorganization Act had provided that the District Court “shall have jurisdic*198tion of appeals from the judgments, orders and decrees of the Island Court in criminal causes as provided in the Penal Code, Part II, Title VIII, and in civil causes . . . .” Guam Code Civ. Proc. § 63 (1953).
The Court of Appeals convened en banc after respondent unsuccessfully sought certiorari before judgment in this Court. 425 U. S. 960 (1976).
Section 23 (a), as enacted in 1950, authorized appeals from final judgments of the District Court of Guam to the Court of Appeals in federal question, habeas corpus, and “all other civil cases where the value in controversy exceed [ed] $5,000 . . . .” Congress repealed this provision in 1951, 65 Stat. 729, but transferred its coverage to 28 U. S. C. § 1291 and thus expanded appealability to criminal cases raising only issues of local law, and to civil cases raising only issues of local law with value in controversy of less than $5,000. 65 Stat. 726. Review of certain interlocutory orders was also authorized by including the District Court of Guam within the coverage of 28 U. S. C. § 1292. 65 Stat. 726. See S. Rep. No. 1020, 82d Cong., 1st Sess., 16 (1951).
Under § 23 (b) as enacted in 1950 direct appeals from the District Court to this Court were available in cases to which the United States was a party and in which the District Court held an Act of Congress unconstitutional. This provision was continued without significant change in 1951 by including the District Court of Guam within the coverage of 28 U. S. C. § 1252. 65 Stat. 726.
The Organic Act of 1950 does not on its face require that the original jurisdiction of the District Court over questions arising under federal law be exclusive, but the implementing legislation passed by Guam in 1951 left federal-question jurisdiction exclusively in the District Court by granting jurisdiction to the Guam courts only over cases arising under local law. Guam Code Civ. Proc. §§82, 102, 112 (1953). This interpretation in Agana Bay Dev. Co. (Hong Kong) Ltd. v. Supreme Court of Guam, supra, at 954, is also not contested here. See n. 3, supra.
See n. 6, supra.
This case does not present, and we intimate no view upon, the question of what categories of cases the Guam Legislature is authorized to determine are nonappealable under § 22 of the Act.
See, e. g., 31 Stat. 141 (§ 86), 36 Stat. 1087, 43 Stat. 936 (Hawaii); 31 Stat. 321 (§§504, 507) (Alaska); 31 Stat. 77 (§35), 38 Stat. 803, 39 *204Stat. 951 (§§ 42, 43) (Puerto Rico); 76A Stat. 51 (Canal Zone); 39 Stat. 1132 (§2), 43 Stat. 936, 49 Stat. 1807 (§§25, 30), 48 U. S. C. §1612, 90 Stat. 2899 (Virgin Islands); 90 Stat. 263 (§§ 402, 403) (Northern Mariana Islands).
'We note that Pub. L. 94-584, enacted in 1976 about a month before our grant of certiorari in this case, authorizes Guam to adopt a constitution for its own self-government but expressly provides that a provision of the territorial constitution establishing a system of local courts “shall become effective no sooner than upon the enactment of legislation regulating the relationship between the local courts of Guam -with the Federal judicial system.” §2 (b)(7), 90 Stat. 2899. This suggests that Congress contemplates that Guam’s judiciary should be treated like the judiciaries of other Territories whose judgments are subject to review by Art. Ill courts. The Guam Legislature has already enacted legislation to provide for a constitutional convention. Act of Dec. 10, 1976, Guam Pub. L. 13-202. Although this may eventually produce a judicial system complying with § 2 (b) (7) of Pub. L. 94^584 and subject to appellate review in Art. Ill courts, we perceive nothing in this prospect that should cause us to abstain from decision of the issues presented in this case.