ALTC.KITS. 247 



oblique ; peristome double, but not thickeued ; columellar margin 

 straight, subvertical, with slight notch below ; operculum multi- 

 spiral, brown. 



" Major diam. 3*8 ; alt. axis 3-2 mm.'' 



Hab. India: Damsaug Peak, Western Bhutan Hills (IT. 7?o6eW). 



" This shell assimilates somewhat, in the character of the con- 

 striction and the expansion of the whorl anterior to it, to A.heben, 

 Bs.; but in the irregular wrinkled portion in advance of the main 

 ridge crossing the swollen part it dilfers materially, and presents 

 a most interesting approach to A. notatus, G.-A., of the Dafia 

 Hills, the surface of which is more irregularly wrinkled and pitted ; 

 it is not so closely umbilicated, and the aperture is more angulate 

 below. It appears to be a most abundant species," {Gochvin- 

 Atisten.) 



366. AlycsBUS diagonius, Godivin- Austen. 



tig. 2; Nevill, Hand List, i, 1878, p. 290; Godwin-Austen, Laud 

 & Freshw. Moll. India, ii, 1914, p. 389, pi. 143, figs, o, bo, 5 b. 

 Alycaeits {Charax) eliaqonim, Ivobelt iS: Mulleudorf, Nachr. Deuts. 



iMalak. Ges. xxix, 1897, p. 152 ; id., Cat. Pneum. 1899, p. 48. 

 Alycaeus [Bicharax) cliagotiius, Kobelt, Das Tierreich, Lief. 16, 

 1902, p. 368. 

 Original description : — " Shell closely umbilicated, turbinate, 

 thin, translucent, pale amber or pinkish colour, finely but distantly 

 costulated on the two last whorls, ch)sely so on the inflated portion 

 of the last ; spire conoid, apex blunt, suture well impressed ; 

 whorls 4, rounded, constricted closely near base of the sutural 

 tube, then swelling largely towards the mouth, the commencement 

 of the swell forming a diagonal or recurved ridge above ; constric- 

 tion smooth, sutural tube 0-053 inch [1-325 mm.] : aperture 

 diagonal, circular ; peristome sinuate, double, inner lip continu- 

 ous, outer expanded, slightly reflected at umbilicus and partially 

 couceahng it. 



" Operculum concave in front, convex behind with a small 

 central boss or nticleus. 



" Major diam. 0-145" [3-65 mm.], minor diam. 0-12" [3 mm.], 

 alt. 0-10" [2-5 mm.], diam. of aperture 0-075" [1-88 mm.]." 



Hab. India: Diyung Valley, North of Asalu, in Ts. Cachar 

 District {Oodivin- Austen); Naga Hills (Roberts). 



" This shell is at first sight very like A. hebes, Bs., but can 

 easily be distinguished by its much narrower umbilicus, its more 

 polished surface and less expanded mouth. 



"A small variety of this shell was obtained and deserves 

 special notice. The striation is wanting throughout, and the 

 costulation on the swollen portion of the last whorl is somewhat 



