The supplemental affidavits were submitted as an attachment to the supplemental legal memorandum on standing requested by the District Court. At the time of their submission, NWF stated only that “NWF now has submitted declarations on behalf of other members of NWF who have been injured by the challenged actions of federal defendants.” Plaintiff National Wildlife Federation’s Statement of Points and Authorities in Support of Its Standing To Proceed 18, n. 21 (Aug. 22, 1988). However, in its reply memorandum on the issue, NWF addressed the contention of the federal parties and the defendant-intervenor that the affidavits should be ignored as untimely filed. NWF stated: “Plaintiff heretofore, has relied on the court’s previous rulings on NWF’s standing. In its motion for a protective order against additional discovery, NWF argued that its standing had already been proven on the basis of the affidavits of Mr. Green-wait, Ms. Peterson, and Mr. Erman. The court agreed and entered the requested protective order. If the court intends to reverse its prior ruling, then NWF respectfully requests that it should be given adequate opportunity to supplement the record.” Plaintiff National Wildlife Federation’s Reply Memorandum in Support of Its Standing To Proceed 17, n. 16 (Sept. 14, 1988). The Federation also noted that Circuit precedent permitted the filing of supplemental affidavits on standing issues, even on appeal.
Ibid., citing
National Wildlife Federation v. Hodel, 268 U. S. App. D. C. 15, 24, 839 F. 2d 694, 703 (1988). NWF offered the further explanation: “Ms. Peterson has supplemented her affidavit to include new information regarding a mine application which has been filed by U. S. Energy Corporation that includes a proposal to mine lands within the area of South Pass/Green Mountain previously closed to mining. For the record, NWF initially was told by officials of the Bureau of Land Management that the U. S. Energy mine application did not include any lands covered by the court’s preliminary injunction. Otherwise, NWF would have supplemented Ms. Peterson’s affidavit earlier.” Reply Memorandum, at 12-13, n. 13. Along with its Reply Memorandum, NWF submitted an additional filing entitled Plaintiff National Wildlife Federation’s Memorandum in Opposition to Defendant-Intervenors’ Motion To Strike Plaintiff’s Supplementation of the Record (Sept. 14, 1988). That filing stated: “For the reasons stated in [the reply memorandum] at page 17, n. 16, plaintiff requests that defendant-intervenors’ motion to strike be denied.” (In light of this sepa*910rate submission, addressed solely to the question whether the supplemental affidavits should be considered, and expressly referring to n. 16 of the reply memorandum, it is difficult to fathom the Court’s assertion that NWF’s request was “buried” in the Federation’s filings. See
ante, at 896-897, n. 5.) This separate filing, in conjunction with the reply memorandum, satisfied Rule 6(b)’s requirement that the request for enlargement of time be made “upon motion.” Though neither of these filings was expressly denominated a “motion,” they met the requirements of Rule 7(b): They were submitted in writing, were signed by counsel, “statefd] with particularity the grounds therefor,” and unambiguously “set forth the relief . . . sought.” See
Campos v. LeFevre, 825 F. 2d 671, 676 (CA2 1987) (“[N]o particular form of words is necessary to render a filing a ‘motion.’ Any submission signed by a party that may fairly be read as a request to the district court to exercise its discretionary powers . . . should suffice”), cert. denied, 484 U. S. 1014 (1988);
Smith v. Danyo, 585 F. 2d 83, 86 (CA3 1978) (“Rule 7(b) requires no more than that... a motion ‘state with particularity the grounds’ upon which it is based. Plainly, an affidavit which is filed to obtain an order disqualifying a judge satisfies the requirements of Rule 7(b). . . . The . . . failure to type in the word ‘motion’ above the word ‘affidavit’ in no way detracts from the notice which the affidavit gave of the nature of the application”). Cf.
Snyder v. Smith, 736 F. 2d 409, 419 (CA7) (“The Federal Rules are to be construed liberally so that erroneous nomenclature in a motion does not bind a party at his peril”), cert. denied,
469 U. S. 1037 (1984);
Miller v. Transamerican Press, Inc., 709 F. 2d 524, 527 (CA9 1983) (“The court will construe [a motion], however styled, to be the type proper for the relief requested”); 2A J. Moore & J. Lucas, Moore’s Federal Practice ¶7.05, pp. 7-16 to 7-17 (1989) (“[I]t is the motion’s substance, and not merely its linguistic form, that determines its nature and legal effect”).