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Show 1879.] 'LIGHTNING'AND'PORCUPINE'EXPEDITIONS. 575 and Bay of Fundy in the N. Atlantic and to Japan in the N. Pacific ; 5-150 fms. Fossil. Post-tertiary or "glacial." Scandinavia, Great Britain and Ireland, Labrador and Canada; 0-130 ft. The most common synonym is L. caudata, Donovan. 3. LEDA FRAGILIS, Chemnitz. Arca fragilis, Chem. Conch.-Cab. vii. p. 199, t. 55. f. 546. 'Porcupine' Exp. 1870 : Atl. St. 10, Vigo B., 13, Setubal B., off C. Espichel, 22, 27-30, 36, Tangier B.; Med. 45, Cartagena B., 50, 54, 55, Benzert Road, Rasel Amoush, Adventure Bank, off Rinaldo's Chair. Abundant in the Mediterranean cruize. Some specimens are more closely striated than others. Distribution. Atlantic coasts of France and Lusitania from Ar-cachon to C. Trafalgar, throughout the Mediterranean to the yEgean, Adriatic, G. of Florida ; 20-185 fms. Fossil. Miocene and Pliocene. Belgium, N . W . Germany, Vienna Basin, Transylvania, Switzerland, S.W. & S. France, Italy, Greece, and Rhodes. This species was unmistakably described and figured by Chemnitz ; and his specific name fragilis was adopted by that painstaking naturalist Dillwyn, and since by Homes and Hidalgo, although the last considered it distinct from tbe Nucula commutata of Philippi, which is certainly the present species. Risso, Chiereghini, and Eichwald gave it other names. 4. LEDA PELLA, Linne. Arca pella, L. S. N. p. 1141. A. interrupta, Poli, Test. utr. Sic. ii. t. 25. f. 4, 5. ' Porcupine' Exp. 1870: Med. St. 50, 55, G. of Bona, Benzert Road, G. of Tunis, Adventure Bank. Varies in the sculpture, like L. fragilis. Distribution. Atlantic coasts of Spain and Portugal, throughout the Mediterranean to the Sea of Marmora, Adriatic, Japan; 4-100 fms. Fossil. Miocene and Pliocene. Antwerp Crag, Poland, Vienna Basin, Switzerland, S.W. France, Italy, Greece, Rhodes and Cyprus. The principal synonyms are Arca interrupta of Poli and Nucula emarginata of Payraudeau. 5. LEDA ARCTICA, Gray. Nucula arctica, Gray in Suppl. App. Parry's first voyage, p. ccli (1824). Portlandia arctica, G. O. Sars, Moll. reg. arct. Norv. p. 37, t. 4. f. 7a-h. L. arctica, B. C. ii. p. 158. Porcupine' Exp. 1869 : St. Loch Torridon. A fine and perfect specimen and two valves, all apparently subfossil. |