belonging to the Genera Helix and Nanina. 85 



Subgenus Rotula, Pfr. (?Albers). 



N. indica, Pfr. Nilgiri Hills. 

 N. Shiplayi, Pfr. Nilgiri Hills. 



Subgenus Ariophanta, Desmoulins. 



N. interrupta, Bens. Bengal. 

 N. Laidlayana, Bens. Orissa. 

 N. Nicobarica, Chemn. Cuddapah (King). 

 N. lsevipes, Mull. Bombay. 

 N. retrorsa, Gould. Molmain (Theobald). 



N. Bajadera, Pfr. Nagpur, small typical var. ; Bombay, large var. 

 '(Theobald). 



From an inspection of the type-specimens of both shells, I 

 have ascertained that N. ammonia, Val., is founded on the type- 

 variety of N. Bajadera, Pfr. I have but little doubt that N. 

 Himalayana, Lea, is N. interrupta, Bens., the Himalayan locality 

 being probably an error. N. retrorsa, Gould, appears, on the 

 other hand, to be a good species. 



Subgenus Oxytes, Pfr. 



N. Thyrseus, Bens. Nilgiri Hills. 



N. Cysis, Bens. Nilgiri Hills. 



N. Cycloplax, Bens. Darjiling. 



N. Oxytes, Bens. KhasiHills (Theobald). 



Genus Helix, Linn. 



Subgenus Tachia, Albers. 



H. fallaciosa, Fer. East coast of Southern India ; Ceylon. 



H. Nilagarica, Pfr. Nilgiri Hills. 



H . asperella, Pfr. Central India. 



H. Helferi, Bens. Andaman Islands (Haughton). 



H. vittata, Fer. East coast of Southern India; Ceylon. 



H. proxima, Fer. Caroor, in Coimbatoor district (King). 



H. delibrata, Bens. Base of Himalayas, in Sikkim ; Khasi Hills 



(Theobald) ; Arakan ; Pegu. 

 H. gabata, Gould. Molmain (Theobald). 

 H. Merguiensis, Pfr. Molmain. 



The last three should perhaps be separated as a distinct sub- 

 genus. H. ruginosa, Fer., appears to be merely a variety of 

 H. fallaciosa, into which it passes by insensible gradations. 

 H. crassicostata, Bens., is more distinct ; but if it prove to be, 

 as Pfeiffer considers it, a variety of H. ruginosa, it must also fall 

 under fallaciosa. The animal of H. vittata shows no essential 

 distinction from that of fallaciosa ; and I can see no cause for 

 its separation as a distinct subgenus, as suggested by Albers. 



