52 NANINA. 



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

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







Prince's Isl., Guinea. 

 X. TALCOSA, Gould. PI. 24, fig. 2. 



Scarcely perforate, rather thin, striate, with four subacute 

 spiral lira?; 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. 

 X. ADANSONJ./E, Morelet. PL 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. 



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

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



Section SITALA, H. Adams, 1856. 



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

 l>\ 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, ivith four or more spiral ribs on the 

 whorls; columellar margin simple, more or less oblique; 

 spire with flat sides ; apex acuminate. 



X. INFULA, Benson. PL 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 turbinifoi-mis, Benson, not Pfeitfer. 



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



Thin, striulate, with f> remote, scarcely elevated spiral lirse, 

 and very minute intermediate strise ; corneous, pellucid ; whorls 

 7, the last thread-carinated. 



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



Ava, Pegu, Mulmain. 



