EUATTSTENIA. 151 



Shell ovately depressed, thin, translucent, polished when young, 

 less so when older, faintly striated, sometimes more densely, pale 

 horny ; spire convex, suture impressed ; whorls 4 J, convex, the 

 last ascending very slightly towards the peristome, rounded at 

 periphery, tumid beneath ; aperture oblique, ovately lunate ; 

 peristome thin, margins converging, upper margin straight at 

 first near penultimate whorl, then arcuate, columellar sinuate, 

 meeting last whorl at an obtuse angle. 



Major diam. 23J, min. 18, height 11 mm. (much larger speci- 

 mens occur, one of the largest measuring 30 x 23 x 13, another 

 26|x 20x12). 



Hob. The Western Himalayas to Kumaun. 



The type of cassida appears to be from Simla, that of stolicz- 

 Jcanus from Almorah in Kumaun. It is possible that there are 

 two distinguishable forms ; but as stoliczkanus is quoted by Nevill 

 from both Kashmir and JN"aini Tal, whilst the type of cassida is 

 from Simla between the two, it is most likely that all are varieties, 

 as was suggested by Nevill. The type of stoliczkanus measured : 

 major diain. 22, height 13 mm. 



The animal of cassida was described by Hutton [from. Simla] as 

 sometimes pale brownish, at others dark grey ; [the shell-lobes in 

 both are speckled and the right has a central vein-like dark streak]. 

 " Two broad leaf-like processes, running to a point, are spread 

 over the shell when the animal is in motion, so as entirely to 

 conceal it, and presenting the appearance of a large grey slug with 

 a hump-back ; a fleshy anal horn, as in the genus Nanina" The 

 last, of course, refers to the lobe above the mucous pore. 



[Formula of a Simla specimen : 33 . 2 . 13 . 1 . 13 . 2 . 33 

 (48 . 1 . 48).] 



236. Euaustenia gurhwalensis, Godwin-Austen (Austenia), MoL Ind. 

 ii, 1899, p. 108, pi. 91, figs. 1-1 h (shell, radula, &c.). 



This is very similar to E. cassida, of which it may be a variety, 

 but it is distinguished by fine microscopic longitudinal spiral 

 striation crossing the plicate ridges of growth. It is more closely 

 wound, the last whorl being narrower, and the mouth higher in 

 proportion to its width ; but as only a single specimen is available 

 for examination, these differences may be more or less of an 

 individual character. There are about 4J whorls. 



Major diam. 21, min. 16, height 10^. 



Hob. Paurhi, Garhwal, North-western Himalayas. 



A thick dart-sac was found, pointed at the retractor muscle. 

 Kadula like that of Austenia gigas. Ehachidian tooth strongly 

 tricuspid ; inner laterals bicuspid ; outer laterals pointed, with an 

 outer cusp some distance from the point ; outermost teeth minute 

 and unicuspid. [Formula : 40 . 2 . 22 . 1 . 22 . 2 . 40 (64 . 1 . 64).] 

 [This and the sculpture make it very distinct from the two 

 preceding species.] 



