BAHULA. M1CEOCYSTINA. 253 



[387.. Rahula Ihotaensis, Godwin- Austen, Mol. Ind. ii, 1907, p. 220, 

 pi. 117, fig. 6 (shell). 



Shell openly and deeply urnbilicated, pyramidal, base very flat, 

 sharply keeled and carinate ; sculpture, costulation close and 

 regular, oblique and sinuate, extending to the basal side ; colour 

 rich brown (burnt-sienna) ; spire conical, apex pointed, sides 

 slightly convex ; suture fairly impressed, with a thin liration. 

 Whorls 7, slightly convex ; aperture quadrate, oblique ; peristorne 

 thin, angulate on the lower outer margin ; columellar margin 

 subvertical, not thickened, slightly reflected. 



Size : major diam. 5'0, alt. axis 4'9 mm. 



Hah. Lhota Naga Hills, Assam (Chennell). 



This is a larger species than the type, and can be distinguished 

 by the more pointed apex, pyramidal form, and very flat base, and 

 the costulation is much closer and finer.] 



[388. Rahula munipurensis, Godwin-Austen, Mol. Ind. ii, 1907, p. 220, 

 pi. 117, fig-. 4 (shell). 



Original description : Shell globosely conic, deeply umbilicated, 

 rounded below the keel, the liration on which terminates at the 

 penultimate whorl ; sculpture distant, very strong and very 

 regular costulation ; colour pale grey, the ribbing showing bright 

 brown ; spire conoid, side nearly flat ; apex rounded ; suture 

 impressed. "Whorls 6, regular, sides very convex ; aperture semi- 

 circular ; peristome fairly thickened, columellar margin subvertical. 



Size : major diam. 3*5, alt. axis 2*25 mm. 



Hob. Manipur Hills, north-east of valley (Godwin- Austen}. 



This is a very distinct little species and the smallest of the 

 genus. I have only found one specimen as yet among the minute 

 Helices I collected in the Munipur Hills.] 



Genus MICROCYSTINA. 



Microcystina, Morch, Jour. Conchyl. xxiv, 1876, p. 357 ; Godwin- 

 Austen Mol. Ind. i, 1882, p. 11 (shells and anatomv) : ii, 1899, 

 p. 110. 



Type, M. rinki, Morch. 



Range. The greater part of the Indo-Malayan Eegion, but 

 within British Indian limits recorded only from the Andaman and 

 Nicobar Islands, Ceylon, Southern India, and Western Bengal. 



Shell thin, horny, depressed to globosely depressed, and only 

 distinguished from Macroclilamys by having the columellar margin 

 of the peristome more broadly reflected and furnished with a 

 projecting angular process which covers the perforation partially 

 or wholly. All Indian forms exhibit microscopic longitudinal 

 striation. 



Animal imperfectly known, somewhat similar to Macrochlamys 

 as regards the right shell-lobes and mucous gland, with an 



