VNJVA L VE MOL L USCA. 



441 



with a well-developed mantle, furnished on the inside with a band of 

 tentacular filaments ; it is able to fold itself over its shell in such a 





Figs. 250 and 251. Cyprsea histno 



Fig. 252. Cyprsea tigrls (Linn.). 



Figs. 253 and 254. Cyprsea argus (Linn.). 



manner as to envelop it all round. The head is provided with two 

 very long conical 'tentacles, each having a very large eye. The foot 

 is oval, elongate, and without operculum, and is well represented in 



