96 VALVATID.E. PILID.E. 



throughout Europe, Siberia, and Asia Minor, is taken from Reeve's 



*' Land and Freshwater Mollusks indigenous to the 



British Isles " : 



Shell : somewhat globosely heliciform, deeply narrowly um- 

 bilicated, pale straw-colour, semitransparent but solid ; whorls 

 four and a half to five, depressed at the apex, longitudinally 

 densely finely striated, spirally faintly ridged, ridges sometimes 

 obsolete ; aperture somewhat pyriformly rounded. 



" Valvata piscinalis is almost milk-white, showing its bright 

 blue-black eyes very conspicuously on the inner base of each 

 tentacle," 



It is recorded from Kashmir. 



187. Valvata (?) microscopica, G. Nevill. 



Vakata (?) microscopic^ G. Nevill, Cat. Moll., Fasc. E, 1877, & 

 Hand List, pt. 2, p. 17. 



Original description : Shell exceedingly minute, orbicular, 

 moderately thin, depressed, and discoidal ; whorls four, moderate, 

 convex, with distinct suture, the last whorl increasing rapidly ; 

 the shell, both above and below, rugosely and distinctly spirally 

 striated, deeply umbilicated, with rounded and proportionately 

 rather large aperture : the specimens were coated with some thick 

 black deposit; when cleaned the shell presents a brownish-red 

 appearance ; the operculum examined under the microscope is 

 horny and circular, of comparatively rather thick substance ; it 

 appears to be multispiral, but we were not able to make out the. 

 structure quite satisfactorily. 



Diara. 1*5 mm. 



Hab. Port Canning, in brackish water. 



Family PILIDJE [~Amjndlariidci\. 



Subfamily PILING. 

 Shell globose, large, holostome, with calcareous operculum. 



Genus PILA. 



Pila, Bolten, Mus. Bolten. 1798. 



Ainpullaria, Lamarck, M6m. Soc. Hist. Nat. Paris, 1790, p. 76. 



TYPE, Helix ampullacea, Linn. ; Malaysia. 



Range. S.E. Asia ; C. Africa. 



Shell turbinate, globose, with little exserted spire ; aperture 

 oblong, oval ; labrum arched, simple, occasionally reflexed ; 

 operculum calcareous. 



