66 Contributions to Indian Malacology. [No. 2, 



Contributions to Indian Malacology, No. V. Descriptions of new land 

 shells from Arakan, Pegu, and Ava ; with notes on the distribution 

 of described species. — By William T. Blanford, A. R. S. M. t 

 F. G. S. 



[Eeceived 11th March, 1865.] 



Order— PULMONIFERA. 



Family Helicidce. 



Genus NANINA. 



Section Macrochlamys. 



1. N. compluvialis, n. sp. 



Shell perforated, subglobosely depressed, thin, light-coloured, horny, 



smooth, polished, diaphanous, very minutely striated. Spire convex ; 



suture in a deep and rather broad groove, which becomes obsolete at 



the apex. Whorls 4^, convex, sharply angulate above at the edge of 



the sutural groove; the last not descending near the mouth. Aperture, 



oblique, irregularly lunate, of the same form as the whorls, nearly 



equal in height and breadth; peristome thin, in one plane, simple; 



margins distant, columcllar briefly reflexed at the perforation. 



Millem. inch. 



Major diameter, 10 0.4 



Minor ditto, 9 0.36 



Axis, 6J 0.26 



Aperture 5 millem. broad. 



Habitat — Arakan hills. 



This shell is closely allied to N. convallata, Bens, of the Tenasserim 



provinces, and replaces that shell in Arakan. It is distinguished by 



the smaller number of whorls, while the singular sutural channel is 



even more developed, but it varies slightly in size. 



2. N. nebulosa, n. sp. 

 Shell minutely perforated, conoidly depressed, thin, light horny, 

 not polished, minutely striated, and possessing a dull greasy lustre. 

 Spire conoidal ; apex rather acute ; suture impressed. Whorls 6, convex 

 above ; the last rather broader, subangulate above the periphery 

 rounded beneath. Aperture slightly oblique, lunate, the breadth 

 greater than the height ; peristome simple, thin ; columellar margin 

 vertical, slightly reflexed. 



