CALYPTE-^AD^. 



115 



Family IV. Calypte^ad^. 



Shell limpet-shaped, the summit sometimes 

 slightly spiral, directed backwards. Animal with 

 a distinct head, eyes, and tentacles ; muzzle 

 lengthened ; gill-plume single. 



Gcdyptrcea (Lamk.). Cup-and- Saucer. Shell 

 round, conical ; interior with a projecting plate on 

 the hinder side, resembling half a cup. Animal 

 with the mantle plain. 



C. Sinensis. Fig. 166 ; n. s. 



166 167 



TT,,,^ .,.r..w'"""" 



Nfs«r 



168 



Iv 



^7/ ivs 



169 



170 



Pileojpsis (Lamk.). Bonnet. Shell round, conical, 

 with the summit recurved ; interior simple. Ani- 

 mal with the mantle fringed. 



P. Hungaricus. Fig. 167 ; ^n.s. 



I 2 



