MACROCITLAMYS. 143 



[Key to Species of Macrochlamys. 



A. Species from Himalayas west of Nepal. 



a. Subglobose or subglobosely depressed, not labiate, vesicula. 



glauca. 

 nuda. 

 kuluensis. 



B. Species from Eastern Himalayas (Sikhim and 



Western Bhutan). 



a. Labiate . . . ; tugurium. 



maimoaringi. 

 dalingensis. 

 opipara. 

 damsangensis. 



b. Not labiate. 



a'. Subturbinate hodgsoni. 



b'. Depressed. 



a 2 . Spirally (longitudinally) sculptured sequax. 



sequius. 



superflua. 



rakaensis. 



6 2 . Smooth lubrica. 



a 3 . Conoidly depressed, rugose transverse 



(but no longitudinal) sculpture patane. 



perfragilis. 



c. With free caecum to male organ richilaensis. 



sathilaensis. 

 zemoensis. 



d. Shells not exceeding 6 mm. 



b 3 . Longitudinally striated or sculptured . . rorida. 



b*. Smooth darjilingensis. 



C. Species from the Gangetic Valley and Delta, the 



IS. W. Provinces, and Bengal with Rajmahal Hills. 



a. Depressed or eonoidly depressed indica. 



a' . Longitudinal flexuous impressed sculpture . . petrosa (type). 

 b'. Very tine microscopic striae hardwickii. 



b. Smooth ......;.... subjecta. 



lecythis. 

 perplana. 



D. Species from the Assam Hills, North and South of 



Valley. 



a. Labiate atricolor. 



castaneo-labiata. 



hepatizon. 



lata. 



b. Not labiate decussata. 



Ihotaensis. 



rubellocincta. 



bilineata. 



uda. 



cacharica. 



salmonea. 



godwini. 



terminus. 



