128 
MOLLUSCOUS ANIMALS. 
and strongly plaited, the last angular, and the middle strongly plaited, like the upper whorl behind, and plain 
in front, the plait ending in a prominent tubercle. 
Inliab. Icy Cape. 
The specimen is not complete, but it will prove a very distinct species. 
BUCCINUM POLARIS. 
Shell ovate, conical, rather ventricose, thin, white ; whorls ventricose, closely transversely plaited, and 
deeply and closely spirally striated, the upper one with a subposterior, and the last with three or more elevated 
keels. Mouth ovate, inner lip much absorbed; canal only slightly recurved. 
Inhab. Icy Cape. 
This shell is very like B. glaciale in form, but the whorls are deeply striated and closely plaited. The 
shells of this kind appear to be formed of two coats, an opake dead white external one, and a hard pellucid 
white inner one ; the outer one is often eroded, from the apex of the Polar species leaving the under one 
exposed, which being smooth, polished, and without striae give the tips of the shell quite a different appearance 
from the rest. In one specimen the last whorl has three equidistant keels — in the other the hinder keel is 
prominent, and there are three close slight keels in front. There was a fragment of a shell brought from the 
same place with the former, which is deeply spirally striated, longitudinally plaited, and slightly keeled like 
the former, but it is rather more solid, more deeply striated, and the whorl has an extra strong prominent keel 
just before the suture, which gives the shell a very different appearance. I am inclined to consider it only a 
variety of this species. 
Buccinum Donovani. 
Bucc. glaciale. Donovan. Brit. Shells, t. 154. 
Inhab. South Sea. 
The shell differs entirely from the B. glaciale of Lamarck (see Chemn. x.f. 1446,47 and Enc. 399./“. 3.) in 
the whorls being very ventricose and rounded. It varies in the thickness of the shell, and in the whorls being 
more or less plaited, like B. undatum, and also in the whorls being rarely furnished with three or four slightly 
striated spiral keels. B. glucialis of Brown’s Conchology,' said to be taken at Torbay, appears like an 
elongated variety of B. undatum. 
Buccinum Boreale. Leach. App. Ross. Voy. 173. 
This species is very like the coloured varieties of B. undatum , but it is much smaller and thinner than 
the undulated state of that shell. 
Buccinum tenue. t. 36./. 19. 
Shell ovate, conical, thin, pellucid, pale brown, very finely and closely spirally striated, and closely 
longitudinally plaited, the plaits arched regular. The spire acute; the whorls rounded. 
Inhab. Icy Cape. 
The outer coat of this shell is very thin and powdery, and appears to separate very easily, for in most 
specimens there are large spaces in which it has entirely disappeared, leaving a thin, pellucid, smooth shell, for 
the outer coat alone is striated, and in most of the shells it forms the longitudinal plaits. 
TRICHOTROPIS. 
Judging from the figure this animal appears to be very nearly allied to Buccinum. The tentacles are 
placed on the side of the base of a large retractile trunk. The penis is conical; the foot small . — See Zool. 
Journ. iv. t. 9./. 5 & 8. 
