19-i W. T. Blanford — Contributions to Indian Ilalacolofjy. [No. 4, 



Shell imperforate, trocliiform, thin, translucent, pale horny, very 

 minutely and closely striated both obliquely and spirally, so as to be cover- 

 ed, except on the upper whorls, with fine almost granular decussated sculp- 

 ture. Spire nearly conical, with the sides slightly convex ; apex obtuse ; 

 suture very little imjiressed, and with a filiform line above, the continua- 

 tion of the keel on the last whorl. Whorls 6i, increasing regularly, nearly 

 flat, only a little convex, the uppermost quite smooth, the sculpture grow- 

 ing stronger on the lower whorls ; the last whorl sharjjly keeled, not 

 descending, compressed both above and below the keel, with the outer por- 

 tion of the base flat, especially towards the mouth, and decussated, the inner 

 j:)ortion moderately convex and smooth, the sculpture gradually disappearing 

 towards the middle; umbilical region impressed. Aperture diagonal, trian- 

 gular with the sides curved, with three lamelliform teeth inside, all palatal, 

 and in the basal margin : the largest is in the middle of the margin, and 

 is much curved, with its convex side outwards ; it begins by forming a kind 

 of thickening to the lip, and then curves away into the interior of the 

 whorl ; the second is smaller, oblique, and situated near to the columellar 

 margin ; the third is at some distance within the aperture, it is curved, and 

 placed transversely behind the first. Peristome white, somewhat thickened, 

 the basal margin curved forwards near the umbilical region, and angulately 

 curved back near the periphery of the shell ; columellar margin scarcely 

 reflected. Major diameter 0-25, minor 0'23, height 0-18 inch. 



In the figure in the ' Conchologia Indica,' the internal tooth is not 

 shown, although all the teeth are clearly seen through the semi-transparent 

 base of the shell. 



The caudal pore in the animal is very small, and furnished with a lobe 

 in front of it, but the tail is not truncated abruptly as in Hacroclilamys, 

 This is the only note I can find on the soft parts. 



This shell was named in MS. in the year 1861, and a specimen trans- 

 mitted to Mr. Benson, who, however, doubted whether it could be distiu- 

 guislied from the Khasi-hill form described by him as Helix diplodon. The 

 typical specimen of the latter must, I think, have been in poor condition, for 

 it was described as " laevigata, parum striatula", whereas fresh specimens 

 exliibit nearly the same fine subgranulate decussating striation as 8. ? incjra' 

 wee, and Mr. Benson very probably, and very justly, thought that fresh 

 specimens might agree with the Arakan shell in other characters. Subse- 

 quently, fresh specimens of S. ? diplodon were obtained from the original 

 locality by Colonel Godwin-Austen ; and I find that they differ from 

 B. ? infjrami not only in being minutely perforate, a character to which by 

 itself I should attach little or uo importance, but also in having but two 

 teeth in the aperture instead of three, the internal transverse tooth of 

 ? ingrami being deficient in 8. ? diplodon, whilst the other teeth are 



