( 70 ) (Pcclinibranchi. B ucei no ida .) 



g. Cassis. Brug. 



Animal resembling 

 the Buccinum, but the 

 operculum horny and 

 dentated in order to 

 pass between the wrinv 

 kles of the outer lip. 

 PI. 18, fig. 7. 



h. Cassidaria, Lam. 



Animal resembling 

 the Buccinum. 



i. Terebra, Lam. 

 7. Cerithium. 



Shell with a turreted A veil on the head. Two tentacula, far 

 spire, mouth oval, canal apart, with the eyes at 



shoit, curved to the left , the side, 



or backwards ; operculum 

 round and horny. PI. 13, 

 fig. 17. PI. 18, fig. 3. 



8 Murex. Lin. 



Canal of the shell pro- No veil . 

 jecting, straight ; opercu- 

 lum horny. PI. 10, fig. 2. 



a. Murex, Lam. 



A retractile trunk; a tubu- 

 lous prolongation of the man- 

 tle ; operculum small, horny. 

 PI. 18, fig. 4, 6. PI. 19, fig. 2. 



b. Ranella, Lam. 



c. Fusus, Lam. PI. 18, fig. 5. 



d. Turbinella, Lam. 



e. Pleurotoma, Lam. 



f. Pyrula, Lam. 



g. Fasciolaria, Lam. 



9. Strombus. Lin. 



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. S trombus, Lam. 



Operculum horny, long, nar- 

 row; foot small. PI. 19, fig. i. 



b. Pterocera, Lam. 



c. Rostellaria, Lam. 



2 Long tentacula, 

 near to each other, with 

 the eyes at the exterior 

 side. 



