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Show 664 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [NOV. 14, Fossil. Pliocene: Italy. C. pandionis of Verrill and Smith from New England. Nyst considered Dentalium gadus of Montagu identical with D. coarc-tatum of Lamarck and D. " Olivii" of Scacchi. This was clearly a mistake, all the three shells being quite different, and Lamarck's being a well-known species of Ditrypa and belonging to the Annelida. The present species is apparently Siphonodentalium hyalinum of Brugnone. It may be D. ventricosum of Bronn. Calcara referred D. olivi to D. coarctatum of Broechi, which is Lamarck's species. According to Fischer the latter is probably the same as Montagu's D. gadus. I proposed in 1869 the generic name Loxoporus, if Philippi's name Cadulus were not applicable to this group of shells; and later in the same year Stimpson proposed the name Ilelonyx. This genus differs from Siphodentalium in the constriction of the mouth, and in the middle portion of the shell being more or less swollen. In C. olivi, the point or base (if we regard the shell as an inverted narrow siphon) has several slits, as in 8. vitreum ; but the mouth is thickened or encircled with a rim, and is obliquely truncated. It is variable in size and comparative slenderness, both in the living and fossil states. 2. CADULUS CYLINDRATUS, Jeffreys. (Plate XLIX. fig. 6.) C. cylindratus, Jeffr. in Ann. & Mag. N . H . Feb. 1877, p. 158. ' Porcupine' Exp. 1869 : St. 20, 28, 30, 31. Distribution. 'Valorous' Exp., Bay of Biscay ('Travailleur' Exp. 1880); 652-1450 fms. 3. CADULUS GRACILIS, Jeffreys. (Plate XLIX. fig. 7.) C. gracilis, Jeffr. in Ann. & Mag. N. H. Feb. 1877, p. 157. 'Porcupine' Exp. 1870 : Atl. St. 16, 17, \7a. Distribution. ' Valorous ' Exp., Bay of Biscay (' Travailleur ' Exp. 1880); 690 fms. 4. CADULUS SUBFUSIFORMIS, M. Sars. Siphonodentalium subfusiforme, M . Sars, Vid. Selsk. Forh. 1864, p. 21, t. vi. f. 36-44. ' Porcupine' Exp. 1869 : St. 10. 1870, Atl. 2. Distribution. Norway, Shetland, Bay of Biscay (' Travailleur' Exp. 1880), Palermo (Monterosato, as C. abyssicola); 40-650 fms. Fossil. Miocene : Vienna Basin (Homes) ? Post-tertiary : Bar-holmen near Christiania (Crosskey $• Robertson); 30 ft. I had mistaken the present species for that to which Monterosato afterwards obligingly gave my name. In C. subfusiformis the mouth is circular and abruptly truncated ; in C. Jeffrey si the mouth is roundish-oval and obliquely truncated. Professor G. O. Sars first called m y attention to this difference. Both species occur on the western coast of Norway as well as in Shetland. 5. CADULUS PROPINQUUS, G. O. Sars. C. propinquus, G. O. Sars, Moll. reg. arct. Norv. p. 106, t. 20. f. 15, a-b. |