AMPHIPERASIDiE. 



269 



Europaea, Mont. 

 formosa, Gask. 

 globosa, Sow. 

 liordacea, Kien. 

 intermedia, Kien. 

 lathyrus, Diifr. 

 Madagascarieusis, Crmel. 

 napoliua, Duel. 

 oniscus, Lam. 

 oryza, Lam. 

 ovulata, Lam. 

 Pacifica, Gray. 

 pediculus, Linn. 



pilula, Kien. 

 producta, Gask. 

 pulex, Soland. 

 radians, Lam. 

 rosea, Wood. 

 rotunda, Kien. 

 rubinicolor, Gask. 

 sauguiuea, Gray. 

 Solaudri, Gray. 

 subrostrata. Gray. 

 suffusa, Gray. 

 tremeza. Dud. 

 vesicularis, Gask. 



Sub-gen. pustularia, Swainson. 



Shell ovate, depressed ; back with elevated tubercles ; extre- 

 mities slightly produced ; plaits continued over the lips of the 

 aperture in the form of elevated strife. 



limacina, Lam. 

 nucleus, Dinn. 



pustulata. Lam. 

 staphylaea, Linn. 



Sub-gen. epona, H. and A. Adams. 



Shell globose ; back smooth, or ^Yith elevated tubercles ; ex- 

 tremities produced ; teeth continued over lips of the aperture in 

 the form of elevated striae. 



annulata, Gray. 

 cicercula, Gmel. 



globulus, Linn. 

 margarita, Soland. 



Fam. AMPHIPERASID^. 



Teeth on Ungual membrane in seven rows (S'TS), the 

 central teeth triangular, recurved, three-toothed ; lateral 

 teeth converging, the inner conical, recurved, the outer 



