SIOLI.USnA OF INDIA. 171 



this narrows to the vas deferens. The spermatheca is moderately 

 long. 



The jaw has a central projection. 



The radiila has the formula 



52 . 2 . 10 . 1 . 10 . 2 . 52 

 or 64 . 1 . 64 



Similar to that of ^. hensoni, and the teeth are of the same tricuspid 

 type as I have shown in Plate XXXVIII. fig. 2 (Vol. I.). 



My best thanks are due to Mr. F. Ede, of Silchar, for sending me 

 this species, of which I am glad to get the single specimen in a good 

 state of preservation, the radula of A. bensoni and sylhetensis {vide 

 Plate XXXVIII. figs. 2 and 3 c) having been obtained from animals 

 that were found dried up inside their shells. This species from Silchar 

 is very closely allied to both the above, but is distinguished by the 

 long hooked lobe over the mucous pore, which in life must be even 

 rnore extended or hooked than it is in the spirit. In this respect 

 only it resembles A. ghbosa, which I got in the Dafla Hills (Plate 

 XXXVII. figs. 5, 5 a, 5 h). I have now been able to examine the 

 generative organs of this group of small shells ; they are certainly 

 extremely small when compared with A. gigas, Bs., the type of the 

 'genus into which they have been placed, and their shells differ 

 much from the type, being more helicoid in form. Making due 

 allowance for size in the generative organs, there is not much 

 divergence to be seen, particularly in the penis, the position of the 

 retractor muscle is the same, in fact the only difference to be found 

 is the absence of the kale-sac where the vas deferens unites with 

 the penis. In Austenia gigas it is not large nor long — in this small 

 animal thei'e is scarcely room for it, the whole organ being only 

 0-2 mm. in length, while that of A. gigas is 4-0, or 20 times 

 larger, 



I consider that for the present we can safely leave bensoni and its 

 allies in the genus Austenia. 



Austenia. zemoensis, n. sp. (Plate CVII. figs. 4-9.) 



Locality. Zemo Samdong, Sikkim ( W. Robert). 



Shell (figs. 4, 4 a) rather depressedly globose, thin and mem- 

 branous ; sculpture none, a smooth shiny epidermis ; colour 

 ochraceous with a green tinge ; spire low, rounded, apex just raised 

 above the next whorl ; whorls 3, gradually increasing, the last 

 rounded and tumid ; aperture and peristome not seen (broken 

 below). 



Only one specimen, placed in B.M. Collection, from which the 

 animal (figs. 5 & 5 a) was drawn. 



Its form is very similar to a species from Darjiling in Dr. W. T. 

 Blanford's collection, figured on Plate XXXVII. figs. 2, 2 a, Vol. I. 



