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Show 568 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Julie 17, 1 . MODIOLARIA MARMORATA, ForbeS. Mytilus marmoratus, Forb. Mai. Mon. p. 44. Modiolaria marmorata, B. C. ii. p. 122, pi. iii. f. 3 ; v. p. 171, pi. xxviii. f. 1. ' Porcupine' Exp. 1869 : St. 9, the Minch. 1870 : Atl. Vigo B., Tangier B. ; Med. Cartagena B., Capo de Gata, Adventure Bank. Distribution. Bergen to Smyrna, Adriatic, Mogador, Gulf of Suez and Persian Gulf, Canaries, N . Pacific, perhaps S. Carolina as Cre-nella lateralis of Say ; 10-150 fms. Fossil. Pliocene and Post-tertiary. Coralline and Red Crag, Belfast, Belgium, Italy. Cantraine's specific name subpicta has precedence of marmorata by three years ; and that given by Say, lateralis (if applicable to the present species), is still older; but marmorata is now in general use. 2. MODIOLARIA DISCORS, Linne. Mytilus discors, L. S. N. p. 1159. 3Iodiolaria discors, B. C. ii. p. 126 ; v. p. 171, ph xxviii. f. 3. ' Lightning' Exp. : St. 1, 3. Distribution. Arctic ocean in both hemispheres, ' Valorous' Exp., Iceland to Guernsey, west coast of France, Piedmont, iEgean, N.E. America from Labrador to Cape Cod, and N. Pacific southwards to Oregon and Japan ; 0-1785 fms. Fossil. Pliocene and Post-tertiary. Scandinavia, Great Britain, Vienna Basin?, N.E. America; 0-100 ft. Modiola leevigata and substriata of Gray and Modiola leevis of Beck are varieties of the present species, and connected by intermediate gradations with the typical form. 3. MODIOLARIA NIGRA, Gray. Modiola nigra, Gray, Suppl. to App. to Parry's first voyage, p. ccxliv. Modiolaria nigra, B. C. ii. p. 128 ; v. p. 171, pi. xxviii. f. 4. ' Lightning ' Exp. : St. off the Faroe Isles. 'Porcupine' Exp. 1869: St. off Lerwick. Distribution. With M. discors as arctic, Iceland to the Dogger bank, Holland ?, N.E. and N.W. America, Novaya Zemblia, Sea of Okhotsk; 7-350 fms. Fossil. Post-tertiary. Iceland, Norfolk ?, Scotland, N.E. America. This may have been the 31ytilus striatulus of Linne" s ' Mantissa,' as Beck supposed ; but the term " unidentato " makes it doubtful. It is the 3Iodiola nexa of Gould. 4. MODIOLARIA SUBCLAVATA, Libassi. Modiola subclavata, Lib. M e m . Conch, foss. in Atti Pan. iii. (1859), p. 13, f. 7. 'Porcupine' Exp. 1870: Atl. St. Vigo B., Tangier B. Valves only. |