DENTALIID. 115 
SIPHONODENTALIUM, M. Sars, 1859. 
Distr.—S. vitreum, Sars (ciii, 100). N. Europe. 
Shell siightly attenuated, apex incised-lobate. Terminal pedal 
disk concave in the middle, no median tentacles. 
The posterior orifice exhibits two slight notches on each side, 
and the foot is ordinarily vermiform and pointed, expanding 
only in a flower-like shape when the animal uses it as a fulcrum. 
PULSELLUM, Stoliczka, 1868. (Siphonoentalis, G. O. Sars.) Shell 
tubular, thin, smooth or longitudinally ribbed, gradually tapering 
towards the posterior end, which is truncate, with the margin 
entire. The animals closely resemble those of Szphodent. vitreum, 
only showing slight differences in the ciliated fringe of the foot- 
disk, but the shells are readily distinguished from it by the 
entire margin of the posterior end; this distinction also applies 
as regards Dentalium, but the separation from Antale is more 
difficult, being apparently restricted to the more truncated shape 
of the posterior end in the present genus, and to a more hyaline 
structure of the shell. S$. Lofotensts, Sars. 
Caputus, Philippi. 
Syn.—Gadilia, Gray, 1847. Helonyx, Stimpson, 1865. Gadus, 
Deshayes. 
Distr.—2 sp. Norway, Hong Kong. Fossil, numerous ; Palezo- 
zoic, Jurassic, Cretaceous, etc. C. subfusiformis, Sars (cii, 99. 
Shell short, more or less inflated in the middle, apical orifice 
entire, circular, with annular, suboblique internal plica remote 
from the apex. Terminal pedal disk concave in ‘the middle, 
marginal tentacles slightly elongated, median tentacles none ? 
Cadulus differs from Siphonodentalium by the shell being 
quite smooth, transparent and lustrous, tumid in the middle or 
anterior portion, and its mouth encircled by a narrow rim. 
Discuipgs, Jeffreys (1867), 1883. 
Distr.—D. bifissus, Wood. Europe. 
Terminal slits bilateral. Animal whitish, gelatinous ; mantle 
rather thick, forming a collar around the front opening of the 
shell; captacula issuing from within the mantle, numerous, 
capable of so great an extension as to exceed the shell in length ; 
stalks very slender; terminal bulbs oval; foot cylindrical and 
narrow, protruded from the middle of the mouth as from a 
sheath; it is occasionally thrust out in a darting manner and 
suddenly withdrawn, and so swiftly that the point of the foot 
could not be observed; the foot is usually curved towards the 
point; anal tube protruded beyond the narrower end of the 
shell—it consists of an outer and inner part, the latter being 
folded to suit the slit on each side; gills rather short, of a 
brownish color.—J EFFREYS. 
