664 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [NoV. 14, 



Fossil. Pliocene : Italy. 



C. pandionis of Verrill and Smith from New Englanrl. Nyst 

 considered Bentalium 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 Siphoiiodentalium 

 hyalinum of Brugnone. It may be D. ventricosum of Bronn. 

 Calcara referred D. olivi to D. coarclatum of Brocchi, which is 

 Lamarck's species. According to Fischer the latter is probably 

 the same as iVlontagu's D. gadus. I proposed in 18G9 the generic 

 name Loxoporus, if Philippi's name Cadrilus were not applicable 

 to this group of shells ; and later in the same year Stimpson 

 proposed the name Helonyx. This genus differs from Siphoden- 

 talium 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 S. vitreum ; but the mouth is thickened or encircled with 

 a rim, and is obliquely truncated. It is variable in size and com- 

 parative slenderness, both in the living and fossil states. 



ly 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. 

 Distribvtion. '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, I7a. 

 Distribution. ' Valorous ' Exp., Bay of Biscay (' Travailleur ' Exp. 



1880); 690 fms. 



W 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 {Monterosaio, as C. abyssicola) ; 40-650 fms. 



Fossil. Miocene : Vienna Basin {Homes) ? Post-tertiary : Bar- 

 holmen near Christiania (CrossJcey ^ 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 G. Jeffrey si the mouth 

 is roundish-oval and obliquely truncated. Professor G. O. Sars first 

 called my attention to this difference. Both species occur on the 

 western coast of Norway as well as in Shetland. 



6. Cadultjs PROPiNauus, G. O. Sars. 



C. propinquus, G. O. Sars, Moll. reg. arct. Norv. p. 106, t. 20. 

 f. 1 5, a-b. 



