198 



beneath, margin of peristoine convex almost throughout, becoming 

 straight on margin near apex only. 



Major diam. 11, min. 7, height 3 mm. 



Hob. Shan Hills, Burma, east of Fort Stedman ( Woodthorpe). 



Animal dark grey, similar in form to Austenia peguensis. In the 

 odontophore the inner laterals are bicuspid, the outer cusp far 

 below the apical as in A. gigas, the outermost laterals small and 

 unicuspid. 



*299. Austenia sikkimensis, Godwin-Austen, Girasia (Ibycus), Mol. 

 Ind. i, 1888, p. 239, pi. 59, figs. 2, 2 a (animal), 2b (shell); 

 Cockerett (Girasia), A. M. N. H. (6) vii, 1891, p. 106. 

 Girasia (Ibycus) sikkimensis, var. mainwaringi, Godwin-Austen, 

 Mol Ind. i, 1888, p. 240, pi. 59, figs. 3, 3 a, 3 b (animal) ; Neoill,. 

 Hand-l i, 1878, p. 16, no. 37, H. (Austenia) n. sp. 



Shell (from figure) ovate, the apex small, not projecting, much 

 resembling the shell of Austenia cacharica. 



Major diam. 94r mm. (from figure). 



Hob. Independent Sikhirn, 9500 feet ; Chungthung, on the 

 Chakang Stream. Var. mainwaringi from Darjiling. 



" The animal, from the spirit-specimen, appears to be of a 

 pinkish grey when living. The mantle finely papillate and finely 

 sprinkled with small black spots, a few similar distant markings 

 on the side of the foot behind." 



The var. mainwaringi must have been very dark-coloured when 

 living, the mantle-lobes are finely papillate throughout. The foot 

 is very short behind and cut off square. 



In the odontophore the middle tooth of the radula is strongly 

 tricuspid, the inner laterals as usual, the outer as in gigas, 

 bicuspid, the inner point much longer than the other. The 

 extreme outside laterals are very small. 



This species has been regarded as allied to (or identical with) 

 Ibycus jfissidens, Heynemann, but the teeth of the radala appear 

 to be very different. [The teeth of /. fissidens are very similar to 

 those of the genus Leptodontarion of Sarasin.] 



Genus GIRASIA. 



Girasia, Gray, Cat. Pulm. Brit. Mus. p. 61 (1855) ; Godwin- Austen,. 



Mol. Ind. i, 1888, p. 216. 

 Hoplites, Theobald, J. A. S. B. xxxiii, p. 244 (1864). 



Type, G. hooJceri, Gray. 



Range. Himalayas and Assam. 



Shell ovate, usually membranaceous, with a more or less 

 thickened apex, sometimes rudimentary, usually with an oliva- 

 ceous epidermis ; apex white. 



" Animal slug-like, long, mantle largely developed ; shell and 

 dorsal lobes are united all round, and the shell is entirely covered 



