PLATE XIII. 



4. Helix unidentata, Ghemn. 



2. Cerithium gigas, l-4lh. 



3. Achatina fulica.. Lam. 

 [ 4. Argonauta. 



5. Apljsia. 



6. Dolabella. 



7. Interior mould of a Cerithium gigas, l-4th. 



8. Clavatula scabra. 



9. Cjclostoma carinata-, Oliv. 



40. Melania marginata. 



41. Helix cotwidea^ Drap. 

 12. Pw/?# avena, Drap. 



43. Melania cochlearella. 



44. . . costellata. 



45. Bulimus terebraster. 



46. Buccinum Barbadense, Lislcr. 



/z. The head. 

 it. 4 .. tentacula. 

 m. .. mouth. 

 7\ .. trunk. 

 ee. .. eyes. 



o. .. operculum 



