NANTNA. 23 



N. ANCEPS, Gould. PL 4, figs. 61, 62. 



Scarcely perforate, light corneous, striated above, shining 

 below; whorls 6, smooth below the periphery. Diam. 17 mill. 



Tavoy, Burmah. 

 N. ARATA, Blanford. PI. 4, figs. 70, 71. 



Imperforated, thin, corneous, obliquely plicate-striate above, 

 below smooth, a little shining, radiately striulate ; whorls 7, 

 suture submarginate. Diam. 17-23 mill. 



Ava, Yunnan. 



Very close to N. anceps, but the spire is higher, the umbili- 

 cal region more excavated, the peripheral keel less acute, and 

 the epidermis darker. 



N. SERRULA, Benson. PI. 4, figs. 63-05. 



Narrowly umbilicated, whitish horn-color; whorls 7, closely 

 plicatulate above, serrulating the peripheral carina which is 



impressed margined below. Diam. 14 mill. 



Bengal. 

 N. BENSONI, Busch. PI. 4, fig. 66. 



Perforate, grayish white, acutely crenulately carinate ; whorls 

 6, the last scarcely striate on the base. Diam. 12 mill. 



Bengal. 

 N. SOLIDULA, Pfr. PI. 4, fig. 67. 



Scarcely perforate, somewhat solid, obliquety costulate-striate, 

 brownish ; whorls 5^, suture submargined, base with obsolete 

 spiral lines ; columella callously thickened, nearly closing the 



perforation. Diam. 12 mill. 



Habitat unknown. 

 N. CLIMACTERICA, Benson. PI. 4, figs. 68, 69. 



Imperforate, whitish under an olivaceous epidermis, above 

 sharply radiately plicate, smoother below ; whorls 8, narrow, 



spire gradate. Diam. 19 mill. 



Bengal. 

 N. AUSTENI, Blanford. PI. 4, figs. 72, 73. 



Imperforate, thin, corneous, above closely arcuately costulate, 

 the riblets vanishing below the carina, polished, radiately striu- 

 late ; whorls 6J, narrow, slightly gradate ; umbilical region 



impressed. Diam. 15 mill. 



Mt. Garo, India. 



The spire is higher than in N. climacterica, the aperjture more 

 rhomboidal. 



