QQ Zoological Society : — 



2. Operculum polished, with a broad, slightly raised, granulated, 

 submarginal band. Ritena. 



N. plicata (fig. 3). • ii • 



The specimens vary sliglitly iu the distinctness, and especially in 

 the breadth, of the tubercular submarginal band. 



3. Operculum with a broad, raised, convex, smooth, submarginal 

 band. Tenare. 



* Operculum smooth. 

 N. Peloronta (fig. .5). 



** Opercidum granular. 

 N. ornata (fig. 4). The younger shells have the inner Up more 

 o-ranular, and the adult more ridged. 



^. Operculum uniform, granular, ivithout any raised or distinct 

 submarginal band. Natere. 



N. exuvia. 

 N. Malaccensis. 

 N. albicilla (fig. 6), 

 N. Senegalensis. 



* Inner lip granulated. 



1. Ncrita polita. 

 4. N. ornata. 



2. N. lineolata. 

 5. N. Peloronta. 



** Inner lip ridged. 



3. N. plicata. 

 6. N. albicilla. 



N. variabilis. 

 N. Cham(JBleon. 

 N. versicolor. 

 N. tessellata. 



*** Inner lip smooth. 



N. signata. The granules large, in lines. 



N. atru. 



N. inconspicua. 



The Puperita jmpa, from the West Indian Seas, has an oper- 



