52 NANINA. 



slightly shining, smooth and shining below; whorls 7, the last 

 acutely carinated. Diam. 9'3, alt. 7 mill. 



Prince's Isl., Guinea. 

 N. TALCOSA, Gould. PL 24, fig. 2. 



Scarcely perforate, rather thin, striate, with four subacute 

 spiral lirae ; light corneous; whorls 6^, suture subchanneled, 

 carinate-margined, the last whorl with acute peripheral carina, 



base convex. Diam. 7, alt. 6'75 mill. 



Cape Palmas, Liberia. 

 N. ADANSONI^J, Morelet. PI. 24, fig. 3. 



Perforate, thin, corneous brown, obliquely closely costulate 

 above, smooth below ; whorls 6^, the last with sharp peripheral 



angle. Diam. 6, alt. 6 mill. 



Gabon Country, W. Africa. 



N. PALMARUM, Morelet. (Unfigured.) Cape Palmas, W. Africa. 

 N. BIFILARIS, Dohrn. (Unfigured.) Liberia. 



Section SITALA, H. Adams, 1856. 



The grouping of the species is as far as possible that given 

 by Godwin-Austen in the second part of his " Land and Fresh- 

 water Shells of India." 



A. Shell small, pyramidal, closely umbilicated, keeled, more or 

 less flat below, with four or more spiral ribs on the 

 whorls; columellar margin simple, more or less oblique; 

 spire with fiat sides ; apex acuminate. 



N. INFULA, Benson. PI. 24, figs. 4, 5. 



Yellowish corneous, thin, 5-7 striate with distant lines above, 

 smooth below and more shining ; whorls 6. 



Diam. 8, alt. 7 mill. 



Lower Bengal. 



It is Helix turbiniformis, Benson, not Pfeiffer. 



N. ATTEGIA, Benson. PL 24, figs. 6, 7. 



Thin, striulate, with 6 remote, scarcely elevated spiral line, 

 and very minute intermediate stria, 1 ; corneous, pellucid ; whorls 

 7, the last thread-carinated. 



Diam. and alt. 8 mill, to Diam. 10, alt. 7*5 mill. 



Ava, Pegu, Mulmain. 



