PLATE XIII. 
. Helix unidentata, Chemn. 
wo = 
Cerithium gigas, 1-4th. 
. Achatina fulica, Lam. 
. Argonauia. Laaber oun lade 
. Aplysia. 
- Dolabella. 
SIO oO & ww 
- Interior mould of a Cerithium gigas, 4-Ath. 
Clavatula scabra. 
© © 
Cyclostoma carinata, Oliv. 
10. Melania marginata. 
11. Helix conoidea, Drap. 
12. Pupa avena, Drap. 
13. Melania cochlearella. 
44... costellata. 
15. Bulimus terebraster. 
16. Buccinum Barbadense, Lister. 
h. The head. 
. «tf. ..  tentacula. 
“m. .. mouth. 
Bo run: 
ee. .. eyes. 
RSS tec 
Oo. .. operculum. 
