MOLLUSCOUS ANIMALS. 
129 
COLUMBELLA. 
The tentacles are close together at the base; the eyes are two-thirds from the base of the tentacles. The 
trunk is cylindrical from the under side of the tentacles. The mantle edge is simple, with a rather long siphon 
in front. The male organ is elongated, subcylindrical, slender. The trunk is very long, large. The foot 
rather small. The operculum is horny, oblong, like that of Buccinum, with a subcentral longitudinal rib on 
the inner side. 
COLUMBELLA CR1BRARIA. 
Buccinum cribrarium. Lam. Hist. n. 43. 
Columbella mitriformis. Brod. & King. Zool. Journ. — Lister. Conch, t. 929. 
/• 24 . 
The apex of this shell is constantly truncated like the apex of some of the land shells; this is not com- 
mon amongst marine shells, which has caused the only other group of sea shells in which this truncation has 
been observed to be called Truncatella. I have not observed it in any other Columbella ■ The synonym of 
Lamarck is added on the authority of his cabinet, and of the plates of the species which have been engraved 
from the shell in his cabinet by the Prince Massena. 
Lister’s figure is rather larger than the specimen there seen, and the mouth is rather more striated. It 
has a thin, dark brown, homy operculum which is nearly as large as the mouth. 
Columbella costellata. t. 3G. /. 9. Sow. Zool. Proc. 
Inhab. Panama & Coast of A^-ica. 
Columbella marmorata. t. 36./. 11. 
Shell ovate, fusiform, smooth, white, yellow marbled; apex reddish; front spirally striated; spire 
conical, shorter than the mouth ; whorls rounded. Mouth narrow, white, outer lip denticulated. 
Inhab. 
Columbella unizonalis. 
Shell ovate, lanceolate, smooth, dark chocolate brown; spire conical, acute, as long as the mouth; 
whorls convex, last with a central white band and spirally striated in front. Mo^(h ovate; outer lip simple, 
sinuous, inner lip simple, slightly thickened ; throat smooth. Axis four lines. Operculum thin, pellucid. 
Inhab. Arica, coast of Peru. 
Perhaps rather a Nassa. 
It is to be remarked that Buccinum Icevigatum , B. Brasilianum, B. semiconvexum , B. flexuosum , B. 
corniculatum, B. aurantium, B. dermestoideum, of Lamarck, as well as this species are ColumbellEe; the 
first is Col. concinna of Sowerby. 
OLIVA. 
The foot of these animals is very large, expanded, ovate, and folded longitudinally when contracted into 
the cavity of the shell. The mantle is thin, not in the least expanded, and ends in a very slender, long, 
subulate process behind, which being twisted round the spire forms the groove over the suture. The head is 
quite in front, with two subulate, conical, rather long tentacles. The eyes are placed near the tip of the 
tentacles, which are very thin above them. 
