282 LAI^D AND FRESHWATER 



tumid, very round on periphery; aperture broadly lunate, very 

 oblique: peristome thin; columellar margin slightly I'eflected, 

 not thickened. 



Size: maj. diam. 14-0, min. 12-0; alt. axis 6*0 mm. 



Looked at from above the whorls are wound like those of 

 C durrangensis, G.-A. (Plate CVIII. fig. 5 h), but it is muc-li more 

 globose than that species. 



A specimen in spirit received from Mr. F. Ede from Silchar, 

 has a shell 14 mm. in major diameter and 5-5 height of axis. 

 This is the largest I have seen. 



In another specimen, shell 10 mm. major diameter, the formula 

 of radula was 63 , 2 . 11 . 1 . 11 . 2 . 63 or 76 . 1 . 76 ; the 

 excess being in the marginal teeth. 



Crtptaustenia nongsingbiensis, n. sp. (Plate CXXV. figs. 5, 5«.) 



Locality. Nongsingriang Wood, N.W. Khasi Hills {G.-A.). 



Shell very globosely conoid, imperforate, covered with an 

 epidermis ; sculpture none, surface smooth ; colour bright ochra- 

 ceous ; spire moderately high, depressedly conoid ; suture shallow ; 

 whorls 4, tumid, rapidly increasing, the last ver}^ rounded on the 

 periphery ; aperture widely lunate, oblique ; peristome thin ; 

 columellar margin vertical, not thickened, no reflection. 



Size : maj. diam. 10-0, min. 9-0 ; alt. axis 5*25 mm. 



Cryptaustenia ovum, n. sp. (Plate CXXV. figs. 3, 3o.) 



Locality. Sileuri, Cachar {J. W cod-Mason). 



Shell scarcely perforate, flatly tumidly globose, very thin, 

 membranaceous ; sculptin'e none, somewhat glassy ; colour pale 

 ochi'aceous or straw-colour; spire nearly flat ; suture very shallow ; 

 whorls 3, very rapidly increasing, very rounded on the perijjhery ; 

 aperture very broadly lunate ; peristome very thin, viewed from 

 above very curved forward ; columellar margin feeble, very slight, 

 thickening near umbilical region. 



Size : maj. diam. 13"5, min. 11'25 ; alt. axis 4*0 mra. 



There are six specimens, the largest has been figured, the others 

 are younger shells averaging 10*0 mm. in major diam. 



This was labelled in pencil by G. Xevill M. ajjplanata mem- 

 branacea. 



Crtptaustenia barhiensis, n. sp. (Plate CXXV. figs. 2, 2 a.) 



Locality. Earhi Chu Valley, Sikhim. 



Shell globose, very thin ; sculpture none ; colour pale umber ; 

 spire flattened and rounded ; suture impressed ; whorls 3, first 

 two very small, body-whorl very ample ; aperture very broadly 

 lunate ; columellar margin not seen. 



Size: maj. diam. 14-0, min. 11-0 mm. 



This species is so distinct froui any of this genus hitherto 



