l:}'2 NANINA. 



N. PYLAICA, Benson. PI. 43, fig. 44. 



Covered perforate or iraperforate, rather solid, radiately costu- 

 late above, smoother and shining below ; corneous, base lighter ; 

 whorls 6^, periphery angulate ; parietal wall of aperture with a 

 strong white lamelliform tooth, lip thickened, sinuous, white. 



Diam. 9, alt. 5*3 mill. 



Moulmein, Burma I. 



N. HELICIFERA, Bluiiford. PI. 43, tigs. 31, 32. 



Young shell perforate, ad tilt imperforate but profoundly exca- 

 vated, thin, acutely arcuately costulate above, extending over 

 the carina, smoothly polished and minutely striate below; 

 corneous; whorls 7-7^, the periphery angulated, base with one 

 or two irregular pits corresponding with interior callous deposits ; 

 columella with a spiral lamina, lip slightly thickened within. 



Diam. 10, alt. 7 mill. 



Mts. of Aracan. 



N. INFRENDENS, Gould. PI. 43, figs. 39-41 ; PI. 44, figs. 51, 58-60. 



Imperforate, but deeply impressed below, rugosely striate 

 above, smooth and shining on the base ; whorls 7, periphery 

 angulated ; lip slightly thickened, bearing two connected teeth 

 below the peripheral angle, and a separate additional one on the 



base. Diam. 11, alt. 5-6 mill. 



Tavoy, Burmah. 



Yar. CAPESSENS, Benson. Fig. 51. 



The three teeth subequal. 



Moulmein, Burmah. 



Yar. TICKELLI, Theobald. Figs. 58-60. 



The two outer teeth closer than in the type, almost uniting. 



Moidmein, Burmah. 



N. ATARANENSIS, Theobald. PL 44, figs. 54, 55. 



Imperforate, costulately striate above, smoother below ; light 

 chestnut-color ; whorls 6^, periphery acutely carinated ; lip 

 thickened within, white, the basal portion armed with two teeth, 

 the one nearest the umbilicus small, entering, the other thickened, 

 lamellar, curved, reclining, dentately raised at the extremities. 



Diam. 10, alt. 4'5 mill. 



Ataran River, near Martaban. 



