_g- Cassis. Brug. 
Animal resembling 
the Buccinum, but the 
operculum horny and 
dentated in order to 
pass between the wrin- 
kles of the outer lip. 
Pl. 18, fig. 7. 
h. Cassidaria, Lam. 
Animal resembling 
the Buccinum. 
t. Terebra, Lam. 
7. Cerium. 
Shell with a turreted 
spire, mouth oval, canal 
short, curved to the lett 
or backwards ; operculum 
round and horny. Pl. 13, 
fig. 17. Pl. 18, fig. 3. 
8. Murex. Lin. 
Canal of the shell pro- 
jecting, straight ; opercu- 
lum horny. Pl. 10, fig. 2. 
a. Murex, Lam. 
( 70 ) (Pectinibranchi. Buccinoida.) 
A veil on the head. 
No veil. 
A retractile trunk; a tubu- 
lous prolongation of the man- 
tle ; operculum small, horny. 
Pl. 18, fig. 4, 6. Pl. 19, fig. 2. 
6. Ranella, Lam. 
e. Fusus, Lam. Pl. 18, fig. 5. 
d. Turbinella, Lam. 
é. Pleurotoma, Lam. 
f. Pyrula, Lam. 
g. Fasciolaria, Lam. 
9. Stromeus. Liv. 
Canal straight or in- 
flected towards the right ; 
lip dilating with age but 
preserving a sinus near 
the canal, under which 
the animal passes its head. 
a. Strombus, Lam. 
Operculum horny, long, nar- 
vow; foot small. Pl. 19, fig. 1, 
6. Pterocera, Lam. 
¢, Rostellaria, Lam. 
Two tentacula, far 
apart, with the eyes at 
the side. . 
2 Long tentacula, 
near to each other, with 
the eyes at the exterior 
side. 
