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Show 1879.] 'LIGHTNING' A N D 'PORCUPINE' EXPEDITIONS. 567 terosato, in which some degree of curvature is observable. had written the above I received from Dr. Hidalgo (to whom my best thanks are due for this and other favours) a fine specimen of his M. martorelli, which is considerably incurved in front, with a corresponding arcuation at the back; and it exactly resembles Brugnone's fossil specimen. 5. MYTILUS MODIOLUS, Linne. Mytilus modiolus, L. S. N. p. 1158 : B. C. ii. p. Ill ; v. p. 171, pi. xxvii. f. 2. •Porcupine'Exp. 1870: Atl. Setubal B. A fragment, perhaps fossil. Distribution. Iceland to the west coast of France, White Sea, Labrador to N e w York, Behring Strait to California and Japan, not Greenland nor Spitzbergen; 0-100 fms. Von Schrenck gives as synonyms 31odiola philippinarum of Hanley and Modiola australis of Gray, the former from the Philippine Isles, and the latter from Australia. If these identifications are correct, they would imply a more extensive distribution. Fossil. Pliocene and Post-tertiary. Scandinavia, Great Britain and Ireland, Belgium, Italy, Labrador to Nantucket I. ; 0-470 ft. 6. MYTILUS BARBATUS, Linne. Mytilus barbatus, L. S. N. p. 1156 : B. C. ii. p. 114; v. p. 171, pi. xxvii. f. 3. 'Porcupine' Exp. 1870: Atl. St. Vigo B.; Med. Benzert Road (valves). Distribution. S. & W . England, Wales, and Ireland, southwards to Malta and Alexandria, N. Japan and Gulf of Yedo; 0-95 fms. Fossil. Pliocene. Red Crag, and Italy. 7. MYTILUS PHASEOLINUS, Philippi. 31odiola phaseo/ina, Phil. Moll. Sic. p. 51, t. xv. f. 14. 3Iytilus phaseolinus, B. C. ii. p. 118; v. p. 171, pi. xxvii. f. 5. 'Porcupine' Exp. 1869: St. 1, 2. 1870 : Atl. Vigo B., 25, off C. Sagres, 26, 30, Tangier B. ; Med. Cartagena B., 50, 51, Rasel Amoush, off Rinaldo's Chair. Distribution. Iceland and Finmark to the iEgean and Adriatic ; 0-3000 fms. Fossil. Pliocene and Post-tertiary. Norway, Coralline Crag, Belgium, Italy, and Rhodes ; 0-100 ft. Among "other synonyms are probably Mytilus barbatus of Muller and Fabricius, but not of Linne, and certainly 3Iodiola pusio of Morch, but not of Philippi. I dredged a minute valve of 3Iytilus bidens, Linne, in the ' Porcupine' Expedition of 1870, at Station 17 a. A Foraminifer (Rhab-dammina abyssorum, M . Sars) was attached to it. 31. bidens is a West-Indian species, and has been acclimatized at Barcelona. |