0/4 LAND AND FRESHWATER 



one from the other. The affix var. at last convej's nothing, and a 

 specified name becomes necessary. This seems the best for those 

 Avho may study these shells in the future, and they can form their 

 own Oi)inion as to what extent they are species or subspecies. I 

 often feel that if the variety had been discovered and named first 

 it would be the dominant species, and sometimes it is more repre- 

 sentative of the group it is cast in. Size does not count for much, 

 but this little Garo Hills shell also differs from typical cns2)atus by 

 its much more depressed and difl'erent shape. 



Alyc^its genekosus, u. sp. (Plate CXXXVIII. fig3. 8, 8 a, 8 b.) 

 Xo. 2566 B.M. 



Locality. Khasi Hills (Oodivin- Austen). 



Shell tumidly turbinate, umbilicus narrow, much hidden by last 

 whorl ; sculpture : only some 10 close costse next the short suture, 

 the rest of the shell smooth ; colour pale ochraceous ; spire conic, 

 moderately high, sides flat ; suture impressed, tube short ; whorls 4, 

 constriction cloae to sutural tube, at once followed by a ridge which 

 slopes diagonally to the aperture, surface slightly irregular ; 

 aperture is nearly circular, subangulate at upper outer margin ; 

 peristome double, simple; columellar margin well rounded. 



Size: maj. diam. 3*0; alt. axis 1'4 mm. 



I regret that I did not record the exact locality of this shell in 

 the Ivhasi Hills, as it is a very distinct s])ecies. Three specimens 

 were obtained, and are in the Natural History Museum. 



Altc^us fiabiangensis, n. sp. (Plate CXXXVIII. figs. 2, 2fl, 

 2 6.) No. 2649 B.M. 



Locality. Habiang Garo, on West Khasi harder (Godtvin-Austen). 



Shell minute, turbinate, closely umbilicate, glassy ; sculpture 

 confined to about 16 fine close ribs next the sutural tube, the rest 

 of shell showing very indistinct costulation ; colour whitish ; spire 

 conical; suture impressed, the sutural tube short; whorls 4, the 

 last constricted close to sutural tube, swelling towards the aperture 

 in one broad ridge, liaving subsidiary undulations ; aperture 

 oblique, circular ; peristome : example is young, and tliis is not 

 continuous, it is simple, witli no sign of crenatiou ; columellar 

 margin rounded ; operculum not present. 



Size : maj. diam. 3"0; alt. axis 1*3 mm. 



This shell belongs to a group of Alycaas, characterized by having 

 a short tube and a narrowband of costulation, the rest of the shell 

 being generally smooth and more or less shiny. A. JcJiasiacus, 

 G.-A., is one of the largest of this type of structure; it includes 

 conicus, G.-A., diagonius, G.-A., and jjusilhis, G.-A. 



ALTCiEus HEBEs, Bs. (Plate CXLV. figs. 5-5 h.) 

 Land & Freshw. Moll. Ind. vol. i. (1886), pt. v. p. 191, il. xliii. 

 figs. 1-1 c. 



