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Show 1878.] ' L I G H T N I N G ' A N D 'PORCUPINE' EXPEDITIONS. 411 nor even in the same parts of the ocean. It is clearly unscientific suppose that, because^!, capsula is tiny, it cannot be a good species, in whatever genus it ought to be placed. Until there is some proof or fair presumption that it is embryonic or immature, it would be preferable to retain it in the subgenus of Argiope, for which Dr. King proposed the generic name Gwynia. Genus IV. PLATYDIA. P L A T Y D I A A N O M I O I D E S , Scacchi and Philippi. Orthis anomioides, Sc. & Ph., Moll. Sic. ii. p. 69, t. xviii. f. 9. 'Porcupine' Exp., 1869. : St. 78, 290 f. One of m y specimens is twice the length of any I have seen from the Mediterranean ; the other is minute, of an oval shape, and apparently abnormal. Coast of Portugal, 600 f. (Kent) !; Mediterranean and iEgean, 40-120 f. ; Gulf of Florida, 237 f. (Dall); 'Challenger' Exp., "attached to a specimen of Waldheimia kerguelensis," St. 145, lat. 46° 40' S., long. 37° 50'E., off Prince-Edward Isles, 150 f. (Davidson)! One of m y Tunisian specimens is acutely triangular. The lower valve is sometimes more convex than the upper, as in Anomia ephip-pium, owing to the habit this Brachiopod has of attaching and moulding itself by the under surface to corals and other irregular substances. This is the Terebratula appressa of Forbes, who published it in the same year as Philippi. Mr. Dall referred, to this species the Orthis eusticta of Philippi; but that is a species of Megerlia, and very different from this. According to Professor Seguenza the young of P. anomio'ides is the Terebratula seminulum of Philippi. Mr. Davidson proposed the genus Morrisia for the present species ; but, with true scientific candour, he gave it up in favour of Platydia, which had been described by O. G. Costa a few months previously in the same year. In the 'Annals' for December 1855, he apparently considered Morrisia and Megerlia subgenera of Terebratella; and in July 1861 he queried Morrisia as a distinct genus. However, his present scheme of classification is much more satisfactory ; and I will not presume to criticise it. Genus V. MEGERLIA, (Megerlea) King. MEGERLIA TRUNCATA, Linne. Anomia truncata, L. S. N. p. 1152. M. truncata, B. C. ii. p. 22 ; v. p. 164. 'Porcupine' Exp., 1870: Atlantic, St. 24, 292 f. (and var. monstruosa); 36, 128 f. Mediterranean, 45, 207 f. (and var.), Capo de Gata, 40-69 f. ; 58, 266 f. (and var.); Adventure Bank, 92 f. (and var.). Atlantic coasts of France and Spain, Mediterranean, Adriatic, and jEgean : 10-120 f. Cape of Good Hope, 224 f. (and var.). Canary Isles, 60 f. ' Challenger' Exp., off Teneriffe, 70-75 f. Isle of Bourbon, 200 f. (Deshayes, as Morrisia gigantea). Australia (Angas, |
