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Show 1882.] 'LIGHTNING' A N D 'PORCUPINE' EXPEDITIONS. 683 P. 563. Lima subovata. Between Lisbon and Canaries ('Travailleur ' Exp. 1882) ; 1192 fms. P. 564. Lima subauriculata. Between the Hebrides and Faroes (' Triton' cruize); 570 fms. Josephine Bank ; 110- 120 fms. ,, Lima excavata. Fossil. Pliocene: Calabria (Seguenza)! P. 566. Mytilus incurvatus. Probably a Pliocene fossil of the Bolognese, as Modiola rectemarginata of Foresti. P. 567. Mytilusphaseolinus. Black Sea (Spratt) ; 45-50 fms. P. 569. Dacrydium vitreum. Between the Hebrides and Faroes ('Triton' cruise); 570 fms. Azores ('Josephine Exp.); 200-300 fms. P. 570. Idas argenteus. Between the Hebrides and Faroes ('Triton' cruise); 516 fms. Inhabiting deserted tubes of Teredo megotara in a large water-logged piece of pine-wood, to which the Idas had fixed itself by a strong byssus. It is covered with a pale brownish-yellow epidermis, which rises into fibrous excrescences on the posterior side. Under the epidermis the shell is silvery white. An internal and long cartilage covers the hinge. I was mistaken as to this when I described the species from two small valves. The beak has a reddish colour like that of Cypricardia lithophagella. The shape varies from rhomboidal to oblong. Size of m y largest specimens 3| tenths of an inch or about 8 millimetres. With it in a "commensal" way lived an undescribed species of Cocculina, or a new genus of the same family, to which I propose giving the name of spinigera; this would seem to have fed on decomposed portions of the Teredo. Small Annelids also occupy the tubes and probably have the same habit. The little limpet is coated with a cera-tose sponge, which gives it a prickly appearance. The smaller and younger specimens of Teredo were living when the piece of wood came up in the trawl. Idas argenteus is probably the species of that name noticed by Verrill as var. lamellosa, from 337 fathoms off the coast of N e w England. ,, Area barbata. C. Verd I. (de Rochebrune). „ Area nodulosa. Fossil. Miocene: Marne Vaticano (Ponzi). P. 571. Area tetragoaa. C. Verd I. (de Rochebrune). „ Area antiquata. C. Verd I. (de Rochebrune). P. 572. Area obliqua. Josephine Bank, 340-430 fms. „ Area glacialis. G. Mexico (Dall) ? ,, Area pectunculoides, var. septentrionalis. New England (Verrill); 310 fms.! Between the Hebrides and Faroes ('Triton' cruise); 570 and 608 fms. Mediterranean (Italian Exp., 1881) ; 337-464 fms. |