GASTEEOPODA , 



801 



T/. peregra feeds on tlio green fresh- water algae ; L, stagnah'fj 

 prefers animal substances. 



Fig. 128. L. stagnalis. 



Distrihution, 90 species. Europe, Madeira, India, China, 

 North. America. 



Fossil, 70 species. "Wealden — . Britain, France. 



Sub-genus. Amphipeplea, Nilsson. A glutinosa, PI. XII., 

 Pig. 31. 



Shell globular, hyaline. 



Animal with a lobed mantle, capable of expansion oyer the 

 shell. 5 species. Europe ; Philippines 



Fig. 129. C. imlchra. 



CiiiLiNiA, Gray. Chilian-snail. 



Example, C. pulchra, D'Orbigny, Eig. 129 



Synonym, Dombeya, D'Orbigny. 



Shell oyal, thin, ornamented with dark spots or "wayy bands 

 columella thickened, with one or two strong prominent folds. 



Distrihution, 18 sj^ecies. South America ; in clear running 

 streams. 



Fossil, 1 species. Miocene, Eio Negro, Patagonia. (D'Orb.) 



Physa, Drapamaud. 



Type, P. fontinalis, Pl. XII., Fig. 32. 



Etymology, Physa, a pouch. 



Synonyms, Bulin, Adans. Eivicola, Fitz. Isidora, Ehr. 



