LEPADID.E. 



175 



the whole imbedded in a cavity excavated in 

 shells of Mollusks. 



A. lampas. Fig. 329 ; 



4 



i* 



Sealpellum (Leach). Valves twelve to fifteen ; 

 latera of the lower whorl four or six ; sub-rostrum 

 rarely present ; peduncle scaly. Male minute, 

 parasitic near the orifice. 



S. vulgare. Fig. 330 ; n. s. 



Pollidpes (Leach). Valves from eighteen to 

 one hundred and upwards ; latera of lower whorl 

 numerous ; sub-rostrum always present ; peduncle 

 scaly. 



P. cornucopia. Fig. 331 ; n. s. 



