1871.] Godwin- Austen — Descriptions of AlyccBinm. 9 1 



ed, the last moderately swollen, constricted close to base of sutural 

 tube, with a marked subvertical ridge just behind the mouth. 

 Constriction smooth, sutural tube long, rather thick, — aperture 

 oblique ; peristome round, deeply waved on the upper and outer 

 but not on the columellar margin, outer lip small, slightly expanded. 

 Operculum multispiral, concave in front, with a small projecting 

 boss at the back. 



Animal pale coloured, tentacles dark brown. 



Major diam. 01 8".— Minor diam. 01G".— Alt. O'll".— Diam. of 

 aperture 0-08".— Sutural tube, 0-75". 



Habitat. On Burrail Range, N. Cachar, at about 5000 feet. 



Near A.plectocheihcs, but much larger, the ridge more distant from 

 the peristome and the latter more expanded. In some specimens, 

 the edges of the outer whorls in the operculum are much raised and 

 bent inwards as in Cyat/iopoma. 



Alycseus crispatus, no. sp. PI. IV, fig. 1. 



Shell moderately umbilicated, turbinate, rather thin, pale horny 

 with fine sub-distant plicate costulation on the upper part of the 

 whorls near the suture, smoother below, finely and closely ribbed 

 on the swollen portion of the last whorl. Spire conoidal, apex rather 

 acute, suture well impressed. Whorls 4, rounded, the last moder- 

 ately swollen at the side, next constricted and smooth for a short 

 distance, then traversed by a slightly recurved ridge, more deve- 

 loped in some specimens than in others, with a nearly smooth 

 interval behind the mouth, but gradually becoming impressed 

 with longitudinal undulations near the peristome. Sutural tube 

 moderate. Aperture diagonal, waved on the outer and upper 

 margins. Peristome thickened, irregularly double, expanding 

 with 4 or 5 deep undulations on the right side, extending from 

 the point of junction with the last whorl to the base of the 

 aperture ; the inner salient angles strongly projecting in aged spe- 

 cimens. OjDerculum multispiral, thickened, convex behind, very 

 concave in front. 



Habitat. Khasia, Jaintia and N. Cachar Hills, abundant. 



This form is a close ally of Alycosus sculptilis, Bs. A variety was 

 obtained in the eastern side of the Hill ranges near Asalu &c, and 



