OCR Text |
Show 576 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [June 17, Distribution. Circumpolar in the N. Atlantic and Pacific, Novaya Zemblia, Jenissei B., 'Valorous' Exp., Norwegian arctic Exp. 1878, Iceland, Finmark; 5-1333 fms. Fossil. Post-tertiary or " glacial." Norway and Sweden, Scotland, N.E. America ; 60 fms.-70 ft. Nucula glacialis, Leach; N. truncata, Brown; N. portlandica, Hitchcock ; N. siliqua and N. sulcifera, Reeve. 6. LEDA MESSANENSIS, Seguenza. L. acuminata, Jeffr. in Ann. & Mag. N. H. July 1870, p. 69: Seguenza, Nuculidi terziarie merid. d'ltal. (R. Acad. Line. 1877, separate copy), p. 15, t. iii. f. 15, 15 a-e. 'Porcupine' Exp. 1869 : St. 3, 15, 16, 23, 42. 1870: Atl. J, 2, 3, 3a, 6, 9, Vigo B., 22, 24, off C. Sagres, 25-34, 36; Med. 55, Adventure Bank. Distribution. 'Valorous' Exp., W . Norway, Mediterranean, 'Josephine' Exp. (Azores), 'Challenger' Exp. (between Azores and Bermuda) ; 100-1750 fms. Fossil. Pliocene. S. Italy. B O D Y clear white : mantle having its edges protruded and pouting ; these are plain or slightly jagged, and not ciliated : tubes separate ; the upper tube is cylindrical and long, and has two minute tubercles at the point, one above and the other below: foot extensile, and shaped like that of its congener. The shell is variable in length, and is wholly or partly marked (especially in front) by close and regular concentric striae. After I had published the specific name acuminata, I found that it had been preoccupied for an Oolitic species, the Nucula acuminata of Von Buch, which is also a Leda. I have therefore substituted in the case of the present species Professor Seguenza's M S . name messanensis. Eichwald's L. acuminata is L. fragilis. 7. LEDA PUSTULOSA, Jeffreys. L. pustulosa, Jeffr. in Ann. & Mag. N . H. Nov. 1876, p. 430 ; Seg. Nuc. terz. p. 17, t. iii. f. 17, J 1a-d. 'Porcupine' Exp. 1869 : St. 16, 19, 20, 21, 23, 23a, 28, 30, 31, 58. 1870: Atl. 2, 3a, 17a, 27, 30. Distribution. 'Valorous' Exp., 1450 fms. Fossil. Pliocene. S. Italy. 8. LEDA FRIGIDA, Torell. Toldia frigida, Tor. Spitzb. Moll. p. 148, t. i. f. 3. 'Porcupine' Exp. 1869: St. 9, 23a, 28, 31, 36. 1870: Atl. 1, 2, 3, 3a, 6, 9, 16, 22, 24, 26-34. Distribution. Spitzbergen, ' Valorous' Exp., Novaya Zemblia, Norwegian arctic Exp. 1877 and 1878, Loffoden Isles to Shetland, Palermo, G. of St. Lawrence, N. Japan; 3-650 fms. Fossil. Pliocene and Post-tertiary. English last arctic Exp. (N. lat. 82° 33'), Norway, Reggio and Messina. |