MOLLUSC A or INDIA. 291 



Genus Cryptosoma. 

 {Continued from Vol. II. p. 54.) 

 Faun. Brit. India, Moll. (1908), p. 209. 



Ceyptosoma khyoungensis, Godwin-Austen. Shan Hills. 



Austenia? Tchyoungensis, G.-A. P. Z. S. 1888, p. 241. 

 Faun. Brit. Ind., Moll. (1908) p. 211, as a synonym of Crypto 

 soma prcestans. 



I have very recently seen a specimen attributed to this species 

 in Mr. G. K. Gude's collection. It contained the dried-up 

 animal, so I took it away and soaked it out. C. Ihyoungensis 

 occurred among a batch of shells from Upper Burma which I had 

 received from Mr. John Ponsoubj, they had been collected by 

 Captain Spratt, R.A. Mr. Gude informed me he had purchased 

 it at Stevens's Auction Eooms, out of a lot of duplicate shells sent 

 there by Mr. John Ponsonby. The result of the soaking showed 

 the foot and markings very distinctly, with tbe shell-lobes, but 

 the generative organs were gone. The radula was complete, almost 

 as broad as long, and showed a formula different from that of 

 C. prcestans, viz. : 



166 . 1 . 11 . 1 . 11 . 1 . 166 

 or 178 . 1 . 178. 



In C. prcestans from Moulmain, described in Vol. I. p. 16, the 

 formula is : 



120 . 2 . 7 . 1 . 7 . 2 . 120 

 or 130 . 1 . 130. 



The laterals being thus far fewer in number. 



In the central and admedian teeth the basal cusps are very 

 much suppressed, in C. prcestans they show larger (PlatelV. fig. 12); 

 the laterals are much curved, on narrow plates, with evenly 

 bicuspid points, very small on the margin. 



The jaw is simple, straight, slightly concave on the cutting-edge 

 with no central projection. 



Shell : maj. diam. 14-5, min. 11-5 ; alt. axis 6 mm. 



Surface like rough paper with microscopic close-set dots in 

 relief. 



Original description : — " Shell globose, tumid, not umbilicated ; 

 sculpture covered with an epidermis, smooth ; colour brown, but 

 the specimen with epidermis still remaining is weathered, in life 

 it is probably polished ; spire low, apex rounded ; suture shallow ; 

 whorls 3, the last ample and convex on periphery; aperture 

 nearly circular ; peristome tbin, a strong callus on the body-whorl 

 extending into the interior of the shell. 



" Largest specimen. — Size : maj. diam. 20-5, min. 12-0 ; alt. axis 

 9-0 mm. 



