GASTROPODA, 



19 



Fio:. 12. 



Cassis madagascariensis, with cameo engraved upon it. 

 Side table-case B. 



F\s. 13. 



Tlie Common Whelk (Buccinum undatum). 

 a, siphon ; b, foot ; c, tentacles ; d, eyes ; e, operculum. 



C 2 



