332 Mr. Jeffreys on the Animal of Stilifer Turtoni. 
scription,—viz. Stilifer Broderipui, S. Cumingii, S. fastigiatus, 
and S. solidus of Adams’s ‘Genera,’ and 8S. pyramidalis of 
Mr. Reeve. In the British Museum is an unnamed Séilifer 
from Port Natal, said to have been found attached to the mouth 
of a Starfish. 
It is not improbable that some of the species enumerated in | 
the 2nd section, having an elongated spire, may belong to Hu- 
lima or Niso, stead of to Stilifer. 
I am not aware of any fossil species having been discovered. 
I will now give the result of my examiation of the animal of 
S. Turtoni, from notes made at the time. 
Body white, and delicately stippled; the whole of the upper 
surface is covered with microscopical and extremely short 
cilia, which are in constant motion ; these cilia are arranged 
in scale-like bunches, and by their action produce a cireu- 
lating current. 
Mantle thickened at its edges, and spread over the lower part of 
the shell, so as to form a disk. 
Pallial fold, ov branchial opening, on the right-hand side, form- 
ing a canal which terminates in an oval or roundish hole. 
Head-lobes rounded and flattened, nearly transparent, one on 
each side a little below the snout or mouth. 
Snout rather long when extended, but usually folded inwards 
and trunk-like, slightly bilobed, and placed between the 
tentacles and the foot. 
Tentacles club-shaped, somewhat compressed, thick, and rather 
long, sometimes expanded at the tips, which are blunt and 
widely diverging, but united at their bases ; they are more 
or less strangulated or constricted, usually at about one- 
fourth of the distance from their bases. 
Eyes exceedingly small, seated on the neck or back of the head, 
at some distance behind the tentacles. 
Foot tongue-shaped and elongated, bulbous and forming a 
creeping-disk in front, somewhat tubular in the middle, 
and tapering to a fine point behind; the sole, or under 
part, is slit in the middle for more than three-fourths of 
its length, the opening or commencement of the slit being 
near the bulbous part and oval. 
Male organ spiked, and resembling an auxiliary tentacle. 
Habitat. Whalsey Skerries, Kast Shetland, about 40 miles from 
land, in 80 fathoms, sandy bottom, on an Hehinus Drobachiensis. 
A pair of the Stilifer were attached to the sea-egg on its upper 
surface, between the spmes near the vent or anal orifice; and 
the same part was also covered with about forty clusters of 
