GASTEROPODA PULMONEA. 
31 
orifice is on the right side of this species of shield, and the anus on the 
margin of that orifice. The four tentacula are protruded and re- 
tracted, evolving themselves like the inverted fingers of a glove, and 
the head itself can be partly -withdrawn under the disk of the mantle. 
The genital organs open imder the upper right tentaculum. The 
mouth has only an upper jaw, resembling a dentated cresent, which 
enables these animals to gnaw fruits and hei’bs, which they do with 
so much voracity as to effect considerable injuiy. The stomach is 
elongated, simple and membranous. 
M. de Ferussac distinguishes 
Ariox, Fer., 
In which the respiratory orifice is toAvards the anterior part of the 
shield, which merely contains a feAv calcareous granules. Such is 
Limax Rufus, L, (the RedLimax;) Ferussac, Moll. Terr, et 
Fluv., pi. i. and iii. It is eA'-erywhere to be met with in wet 
Aveather, and is sometimes entirely black, Ib. II, i, 2. A decoc- 
Genus Cassidaria 
.... Cassis 
Riciaula 
Purpura 
Moneceros . . . 
Coucholepas. . . 
Harpa 
Dolium 
Buccinunr 
Eburna 
Terebra 
'I A ascending canal' 
* ■ ' ‘ > recurved back- 
J A\ards, 
1 
Columbella 
Mitra . . . . 
Voluta . . . • 
Marginella 
^'olvaria . , 
I An oblique notch 
y inclining to the 
back. 
r: 
j 1 
Fourth Family. . 
Les Columellaires. 
<: 
Shells having a short canal at 
the base of the opening as- 
cending towards the back, or 
a notch in the form of a semi- 
c.anal, inclined backward. 
The animals of all this family 
produce coloring matter, but 
particularly the G. Purpura, 
from which was extracted 
the celebrated dye of the 
Romans ; it is contained in 
a peculiar reservoir near the 
animal’s neck. All of them 
appear to possess an oper- 
culum. 
r 
No canal at the base of the 
aperture, bixt a subdorsal 
notch more or less distinct, 
and having plaits on the 
columella of the shell. — The 
Columbelhe haA’e a small 
operculum attached to the 
foot of tlie animal. 
Ovula 
Cyprsea .... 
Terebellum .... 
Ancilla,, .... 
Oliva 
Conus 
Fifth Family, 
Les Enrouldes. 
’“Shell without a canal, but hav- 
ing the base of the aperture 
effuse or notched ; the whorls 
of its spire large, compressed, 
rolled I'ound each other, so 
that the last neaidy conceals 
J all the others, rendering the 
spiral cavity large and nar- 
row, and indieating that the 
body of the animal must be 
flattened. The two first ge- 
nera of this family have the 
right lip recurved inwardly ; 
no operculum. 
