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. 
Caleara referred D. olivi to D. coarctatum of Brocchi, 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 Helonyz. ‘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. 
|y 2. Capuxus cyLinpratus, 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 (Hérnes) ?  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. jeffreysi 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. 
5. CapuULUS PROPINQUUS, G. O. Sars. 
C. propinquus, G. O. Sars, Moll. reg. arct. Norv. p. 106, t. 20. 
f. 15, a6. 
