15 



Genus NAN IX A, Gray, 1834. 

 Subgenus ARIOPHANTA, Desmoulins, 1833. 



N. KADAPAENSIS, Nevill. PL 1, figs. 1, 2. 



Shell perforate, solid, obliquely striate, chestnut colored, white 

 zoned at the suture, periphery and base ; whorls 5i, the last 

 descending anteriorly, base inflated ; aperture concolored, lip 

 obtuse, white, columellar margin a little reflected, almost cover- 

 ing the perforation. Diam. 37, alt. 27 mill. 



Kadapa, India. 



Lonii known under the name of Helix Nicobarica. Chemn., but 



C? 7 



is not found at the Nicobar Is. 



N. LAIDLAYANA, Benson. PL 1, tigs. 3, 4, 5. 



Shell narrowly imperforate, thin, obliquely striate, decussated 

 hy crowded spiral stria:, translucent, shining, whitish, with a 

 narrow chestnut zone at the suture, a wider band above the 

 periphery, and a narrow one below it. throat and lip chestnut 

 colored ; whorls 5, suture lightly impressed ; the last whorl angu- 

 lated at the periphery, slightly descending in front, con vex below, 

 columellar margin greatly narrowing the perforation. Diam. 27, 



alt. 15 mill. 



Bengal. 



N. parietalis, Martens, is a synonym. Sometimes only the 

 sutural and a narrow peripheral band are present. 



N. THYREUS, Benson. PL 1, fig. 6. 



Shell umbilicated, depressed, solid, bluish horn color, closely, 

 sharply striate above, with obsolete slight spiral striae ; w r horls 

 5, with sutures scarcely impressed ; bod}' whorl carinated, below 

 the carina obsoletely chestnut fasciated, not descending at the 

 aperture ; base shining, radiatety striate ; interior purplish 

 brown, white zoned in the middle. Diam. 35, alt. 16 mill. 



Southern India. 

 N. rytsolemma, Gray, is a synonym. 



N. CYSIS, Benson. PL 1, figs. 7, 8. 



Shell umbilicated, rather solid, closely plicate striate, light 

 olivaceous horn-colored, under a deciduous epidermis; whorls 5. 

 w r ith impressed suture, the last whorl wider, tumid, slightly 

 descending in front ; periphery very obsoletely angulated ; aper- 



