GASTEEOrODA 



301 



L. peregra feeds on the green fresh-water algae ; L. sfagnalis 

 prefers animal substances. 



Fig. 128. L. stagnalis. 



Distribution, 90 species. Europe, Madeira, India, Chinaj 

 North. America. 



Fossil^ 70 species. Wealden — . Britain, Prance. 



Suh-genus. Amphijpeplea, Nilsson. A glutinosa, PL XII., 

 Pig. 31. 



Shell globular, hyaline. 



Animal with a lobed mantle, capable of expansion over the 

 shell. 5 species. Europe ; Philippines 



Fig. 129. C. pulchra. 



Chilikia, Gray. Chilian-snail. 



Mxample, 0. pulchra, D'Orbigny, Pig. 129 



Synonym, Dombeya, D'Orbigny. 



Shell oval, thin, ornamented with dark spots or wavy bands ; 

 columella thickened, with one or two strong prominent folds. 



Distrihution, 18 species. South America ; in clear running 

 streams. 



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



Physa, Draparnaud. 



Tijpe, P. fontinalis, PI. XII., Fig. 32. 



Etymology, Physa, a pouch. 



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



