FAMILY II. 
4. Conus. Lin. 
Trunk elongating con- 
siderably ; operculum 
placed obliquely on the 
foot, narrow, too short 
to close the mouth of the 
shell; a long respiratory 
tube. Pl. 16, fig. 12. 
2. Cypraa. (1) Lin. 
Mantle large enough to 
curl up and enyelope the 
shell : foot thin; no oper- 
culum. Pl. 16, fig. 11. 
3. Ovuta. Brug. 
4. Trrepertum. Lam. 
5. Vorura. Lin. 
Shell termmated by a 
notch, with projecting 
and oblique folds on the 
columella. Pl. 18, fig. 1,2. 
a, Oliva, Brug. 
A tube above the 
head for respiration. 
6. Voluta. 
An elongated trunk, 
cylindrical and retrac- 
tile, with small crook- 
ed teeth; a respiratory 
tube projecting ob- 
liquely behind the 
head ; foot very large ; 
no operculum. PI. 48; 
fig. 2. 
c. Cymbium. 
A very large foot; 
no operculum. Pl. 18, 
fig. 1. 
( 68 ) 
GENERA. 
Tentacula elongating 
considerably. 
Tentacula moderate. 
2 Long pointed tenta- 
cula. 
2 Pointed  tentacula, 
from a veil on the head. 
2 Tentacula, from a veil 
on the head. 
(Pectinibranchi.) 
BUCCINOIDA. 
Eyes near the points 
on the outer side of the 
tentacula. 
- 
Eyes at the outer base, 
Eyes towards the mid- 
dle of the tentacula, 
Eyes at the outer base. 
Eyes on the veil outside 
the tentacula. 
(4) The mantle is sufficiently large to turn back upon the shell and envelope it ; 
at a certain age it covers the shell with a layer of another colour, so that this differ- 
ence, added to the form assumed by the aperture, might cause the adult to be 
taken for another species. 
V. p. 41. 
