GASTEROPODA. 301 
L. peregra feeds on the green fresh-water algae; L. stagnalis 
prefers animal substances, 
Fig. 128, L, stagnalis. 
Distribution, 90 species. Europe, Madeira, India, China, 
North America. 
Fossil, 70 species. Wealden—. Britain, France. 
Sub-genus. Amphipeplea, Nilsson. A glutinosa, Pl. XII, 
Fig. 31. 
Shell globular, hyaline. 
Animal with a lobed mantle, capable of expansion oyer the 
shell. 85 species. Hurope; Philippines 
Fig. 129. C. pulchra. 
CHILINIA, Gray. Chilian-snail. 
Example, C. pulchra, D’Orbigny, Fig. 129 
Synonym, Dombeya, D’Orbigny. 
Shell oval, thin, ornamented with dark spots or wavy bands 
columella thickened, with one or two strong prominent folds. 
Distribution, 18 species. South America; in clear running 
streams. 
Fossil, 1 species. Miocene, Rio Negro, Patagonia. (D’Orb.) 
Puysa, Draparnaud. 
Type, P. fontinalis, Pl. XII., Fig. 32. 
Htymology, Physa, a pouch. 
Synonyms, Bulin, Adans. Rivicola, Fitz. Isidora, Ehr. 
