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Show 578 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [J 11. L E D A STRIOLATA, Brugnone. Yoldia striolata, Brugn. Misc. Mai. (pars secunda, 1877), p. 9, f. 9. Y. abyssicola, Seg. Nuc. terz. d'lt. (1877), t. v. f. 28, 28a. ' Lightning ' Exp.: St. 3. 'Porcupine' Exp. 1869: St. 39, 42, 47. 1870: Atl. 3a, 9, 16, 17, 17a, off C. Espichel, 22, 24, 31-34. Distribution. Palermo; 114 fms. Fossil. Pliocene. Calabria and Sicily. Differs from the last species (L. lenticula) in being flatter, more sharply pointed or wedge-shaped at the anterior end, and concentrically striated ; the striae are regular and sometimes numerous, but usually distant and covering the front only. The epidermis in living specimens is yellowish-green. Striolata is not a classical word; and I had provisionally named this species acutalis, but of course give way to the previous publication. Monterosato gave it the M S . name of producta. 12. LEDA INTERMEDIA, M. Sars. Portlandia intermedia, (M. Sars), G. O. Sars, Moll. reg. arct. Norv. p. 38, t. 4. f. 9, a-b. 'Porcupine'Exp. 1870: Atl.St.16. A few valves, mostly imperfect. Distribution. Greenland, Spitzbergen, ' Fox ' Exp., Novaya Zemblia, Norwegian arctic Exp. 1878, Dutch arctic Exp., Finmark; 25-1333 fms. Not a North-Pacific species which I received from Mr. Dall as the Yoldia intermedia of Sars on the authority of the late Dr. Philip Carpenter. 13. LEDA LUCIDA, Loven. Yoldia lucida, Lov. Ind. Moll. Scand. p. 34. L. lucida, B. C. ii. p. 155 ; v. p. 173, pi. c. f. 1. 'Lightning' Exp.: St. 1, 2, 3, 5. 'Porcupine' Exp. 1869: St. 9, 13, 14, 15, 16, 19, 22,28,62. 1870: Atl. I, 2, 3, 3a, 9, 13, 16, 17, 17a (var. declivis; anterior end more sloping and not so much upturned nor pointed), 176 (var. truncata; anterior end abruptly cut off) ; Med. 55. Distribution. Swedish arctic Exp. 1868, 'Valorous' Exp., Novaya Zemblia, Norwegian arctic Exp. 1878, Finmark to Bohuslan, Palermo, G. St. Lawrence to Massachusetts B.; 10-730 fms. Fossil. Post-tertiary or "glacial." Norway, and Clyde beds. According to his description and figure, Seguenza's Yoldia lucida is a variety of L. pellucida. The latter species differs from L. lucida in being wedge-shaped and terminating in a point on the anterior side ; L. lucida is in that part more or less upturned and squarish. The present species is L. obesa of Stimpson. 14. LEDA PUSIO, Philippi. Nucula pusio, Ph. Moll. Sic. ii. p. 47. t. xv. f. 5. L.pusio, var. latior, Jeffr. Ann. and Mag. N. H. Nov. 1876, p. 430. •Porcupine' Exp. 1869: St. 16, 28; 1870, Atl. 3a, 16, 17a, off |