MOLLUSCA OF INDIA. 191 
Shell depressedly turbinate, openly umbilicated, small; sculpture, 
apical whorls quite smooth, some distinct distant costulation on the 
posterior side of the last whorl, succeeded by very fine and close on 
the swollen portion of the same ; colour dull whitish ochre ; spire sub- 
conoid, apex blunt ; suture impressed, the tube short ; whorls 4, the 
last swollen, the constriction close to the sutural tube, slightly enlarg- 
ing again midway between it and the peristome, and this portion quite 
sinooth ; aperture oblique, ovate, angular above and below; peri- 
stome double, thickened, with a well-defined notch below, columellar 
margin concave ; operculum multispiral, horny, brown. 
Size: major diam. 3-2, alt. axis 2°6 mm. 
5 OS ewe, ty al slals neh, 
This shell finds its nearest ally in A. gemmula, Bs., of the Darji- 
ling side, but the distinct ridge next the constriction is reduced toa 
mere even swelling of the whorl, and the peristome and form of 
aperture differ ; it is also larger. 
ALycaus HEBES, Benson. (Plate XLIII. figs. 1, 1a, 16, 1c.) 
Locality. Teria Ghat, south base of Khasi Hills. 
Alycaus hebes, Benson, A. M. N. H. 1857, vol. xix. p. 204. 
Charax hebes, Benson, A. M. N. H. 1859, vol. iii. p. 177 (type of 
subgenus). 
Alycaus hebes, Pfr. Mon. Pneum. vol. ii. p. 37; Pfr. Novit. 
Conch. pl. xxxv. figs. 28-31 ; Hanley, Conch. Ind. p. 38, pl. xciii. 
figs. 5, 6; Theob. Supp. Cat. p. 39; Nevill, Hand-list, p. 290; 
Blanford, A. M. N. H. 1864, vol. xii. p. 459. 
Original description :—‘ Vesta umbilicata, solidiuscula, depressa, 
vie striatula, ad spatium inflatum et circa umbilicum confertissime 
striata, carneo-albida, apicem versus rubella; spira conoidea, apice 
obtustusculo, sutura impressa ; anfractibus 4 convexiusculis, ultimo 
ad latus gibboso, tubulum mediocrem suturalem gerente, spatio con- 
stricto costa valida retro recumbente munito; apertura obliqua, 
circulart ; peristomate continuo, duplict, interiort porrecto, exteriort 
expanso, incrassato. 
** Diam. major 4, minor 3, axis 3 mill. 
‘* Hab, ad Teria Ghit. Teste W. Theobald. 
‘This species occurs on rocks, and is distinguished by the struc- 
ture of the aperture from the small Bornean A. spiracellum, A. & R. 
In the latter species, moreover, the rib behind and above the aper- 
ture is nearly parallel with the peristome, whereas in A. hebes it 
looks like a loop which had fallen backwards on the whorl. In both 
species it takes its rise at the right side of the peristome, and ends 
at the suture, corresponding with an internal sulcus.” 
ALyca&us Nnoratus, Godwin-Austen. (Plate XLIII. figs. 2, 2a, 
2 6.) 
Locality. Toruputu Peak, Dafla Hills. 
Alycaus notatus, Godw.-Aust. J. A. 8. B. 1876, p. 176, pl. vii. 
figs. 9, 9a, 96; Nevill, Hand-list, p. 291. 
