NANINA. 87 



Unfigured Species. 

 N. ARNOTTI, Benson. Cape of Good Hope. 



N. FOULLIOYI, Le Guillou. New Guinea. 



N. SALOMONIS, Le Guillou. Solomon Is. 



Section MACROCHLAMYS, Benson, 1832. 



Mr. Benson describes particularly the habits of the species 

 observed by him, which he first discovered living at Banda, in 

 Bundelkund, on the prone surface of a rock. The animal carries 

 the shell horizontally, or nearly so, is quick in its motions, and, 

 like Helicolimax, it crawls the faster when disturbed, instead of 

 retracting its tentacles like the snails in general. In damp 

 weather it is rarely retracted within its shell, the foot being so 

 much swollen by the absorption of moisture that if it is suddenly 

 thrown into boiling water the attempt to withdraw into the shell 

 invariably causes a fracture of the aperture. In dry weather 

 the foot is retracted, and the aperture is then covered with a 

 whitish false operculum similar to that of the other Helicidse. 

 The two elongated processes of the mantle are continually in 

 motion, and exude a liquid which lubricates the shell, supplying 

 apparently that fine gloss which is observable in all recent 

 specimens. The fluid poured out from the orifice at the base of 

 the caudal horn-like appendage is of a greenish color; it exudes 

 when the animal is irritated, and at such times the caudal 

 appendage is directed towards the exciting object in such a 

 manner as to give the animal a threatening aspect. Godwin- 

 Auxten, Shells of India, Hi, 76. 



The above author has arranged some of the species in groups, 

 but I cannot make use of his arrangement because it only 

 includes a small portion of the Asiatic species herein included 

 by Pfeiffer. I follow the latter, intercalating Austen's new 

 species as well as I can. 



N. VESICULA, Benson. PI. 28, figs. 9-14. 



Narrowly perforate, thin, smoothish, shining ; light-corneous ; 



whorls 6, suture profound. Diam. 15, alt. 7 '5 mill. 



Himalaya Mts. 

 Var. LECYTHIS, Benson. PL 28, figs. 12-14. 



Subperforate, reddish corneous. Diam. 13-15, alt. 7-9 mill. 



Rajmahal Hills, India. 

 N. mucosa, Blanford, from the Nilgherry Hills, India, is sup- 



