302 INDIA CHAP. 



Boysia^ with its twisted upturned mouth, while Lithotis is a 

 peculiar form allied to Succinea^ to which group also probably 

 belongs Camptonyx^ a limpet-like form with a very small spire, 

 peculiar to the Kattiawar peninsula. Camptoceras^ an extraor- 

 dinarily elongated sinistral shell, with a loosely coiled spire, is 

 peculiar to the N.W. Provinces. 



Among the fresh-water pulmonates is an AmpuUarina, a 

 genus onl}^ known elsewhere from the Fiji Is. and E. Australia. 

 Cremnoconchus is a form of Littorina^ peculiar to the W. Ghats, 

 which has habituated itself to a terrestrial life on moist rocks 

 many miles from the sea. The fresh-water operculates include 

 the peculiar forms Mainwaringia^ from the mouth of the Ganges 

 (intermediate between Melania and Paludomus)^ Stomatodon, 



Fig. 202. —Characteristic Indian Mol- Fig. 203. — Streptaxis 



lusca : A, Hypselostoma tubiferum Perroteti Pfr., Nil- 



Blanf . ; B, Camptoceras terebra Bens. ; ghiri Hills : A, adult ; 



C, Oamptonyx Theobaldi Bens. A', young form. 



Larina^ Fossarulus, Tricula, and others. The bivalves are 

 neither numerous nor remarkable; Velorita, a genus of the 

 Cyrenidae, is peculiar. 



The land operculate fauna of India is singularly rich and 

 varied. About 25 genera, and at least 190 species, occur. Here 

 we find the metropolis of Cyclophorus among the larger forms, 

 and of Biplommatina and Alycaeus among the smaller. A large 

 proportion of the operculate genera are quite peculiar to the 

 extreme south of India and Ceylon. The appearance of a few 

 species of the European genus Pomatias is very remarkable. 



The carnivorous genera are poorly represented. A few 

 Ennea occur, while Streptaxis is practicall}^ confined to the 

 extreme south and north-east. 



J 



