68 Contributions to Indian Malacology. [No. 2, 



that species is very different. This small form differs from N. hypoleuca 

 in its more marked spiral sculpture, which, however, is still microscopic. 



Section Hemijilecta. 



4. N. UNDOSA, 11. Sp. 



Shell narrowly umbilicated, depressed, rather solid, white (? horny 

 when fresh,) peculiarly marked with irregularly sinuous close spiral 

 sculpture resembling scratches, and crossed by oblique lines of growth. 

 Spire very depressly conoid ; apex obtuse ; suture impressed. "Whorls 

 5, rather rapidly increasing, somewhat convex ; the last broader, 

 rounded at the periphery and below; the spiral sculpture passing 

 over the periphery and gradually dying out on the lower surface, 

 which is marked by radiating striae Mouth diagonal, broadly lunate, 

 equally broad and high ; peristome simple, acute ; margins distant, 

 united by a callus ; columellar margin oblique, shortly reflexed above. 



Millem. inch. 



Major diameter, 36' 1.45 



Minor ditto, 31 1.24 



Axis, 21 0.84 



Aperture 18 millem. broad. 



Habitat — Shan Hills, east of Ava. Distinguished by its peculiar 

 sculpture; which somewhat recalls that of Nanina Humphrey siana, 

 Lea. All the specimens found were dead and bleached ; fresh speci- 

 mens possibly possess a coloured epidermis. 



Section Sesara. 



5. N. IIELICIFERA, n. Sp. 



Shell imperforate when adult, but with a deep umbilical hollow ; 

 young specimens deeply perforate ; conoidly trochiform, subcampanulate, 

 tli in, horny, sharply and arcuately costulated above, the costulation 

 continuing over the periphery; smooth, polished and finely striated 

 beneath. Spire conoid, sides convex ; apex rather obtuse ; suture im- 

 pressed. Whorls 7 — 7J, closely wound, convex, increasing very 

 slowly ; the last angulate at the periphery in adults, sharply keeled in 

 immature specimens, flattened beneath, more convex near the mouth 

 with one or two small, irregularly shaped indentations, (which are 

 mostly opaque from a coating of white callus within the shell), on the 

 lower surface, generally at a distance of about J a whorl from the 



