ORDER PECTINIBRANCHIATA. ves 
MARGINELLA, Lam. 
Form of the shell similar to that of a true voluta, but the 
external margin of the aperture is tumid; the emargination is 
but slightly marked. The foot of the animal, according to 
Adanson, is very large, and has no operculum. By turning 
up the lobes of its mantle, it partly covers the shell. The 
eyes are on the external side of the base of its tentacula. 
(Voluta glabella, Adans., &c.) 
M. de Lamarck also distinguishes the COLOMBELLA, in 
which the folds are numerous, and the rim of the external 
margin is enlarged at its centre. It appears that the opercu- 
lum is wanting. (Voluta mercatoria, List., &c.) 
Mirra, Lam. 
The aperture oblong, with a few large folds on the columella, 
the one nearest the spire being the largest; the spire usually 
pointed and elongated. Several species are brilliantly spotted 
with red on a white ground. ‘The foot of the animal is small ; 
the tentacula are of a moderate length, with the eyes on the 
side, near their inferior third ; the siphon is also of a moderate 
length, but it frequently protrudes a proboscis longer than its 
shell. 
CANCELLARIA, Lam. 
The last whorl swollen out, aperture ample and round, the 
internal margin forming a plate on the columella; the spire is 
salient and pointed, and the surface of the shell marked with 
crossing furrows. (Voluta cancellata, L.) 
BuccinuM, Lin., 
Comprises all the shells furnished with an emargination, or a 
short canal inflected to the left, and in which the columella is 
destitute of folds. 
