192 LAND AND FRESHWATER 
Original description :—* Shell globosely turbinate, narrowly um- 
bilicated, of solid form; white, distant strong costulation on the 
upper whorls, close and fine ribbing on swollen portion of the last. 
Spire conoid, suture fairly impressed. Whorls 43, closely wound, the 
last swollen, then sharply constricted, and again enlarged and 
descending, the expanded portion being marked ‘with deep fold-like 
furrows. Sutural tube moderate, aperture oblique. Peristome very 
thick, distinctly treble in full-grown shells, outer layer terminating 
just behind the aperture, the inner continuous, the two outer much 
reflected near the umbilicus. Operculum smooth i in front. 
“* Alt. 0:14, major diam. 0°17 in. 
“ Hab. On the slopes of Tortptiti Peak at 3000 feet, about 15 
specimens collected. 
“This is one of the most distinct and curious species I have as 
yet discovered, the fold-like indentations upon the expanded portion 
near the aperture having no counterpart in any other form with 
which I am acquainted. In other respects it is somewhat similar 
to A. diagonius, in the strong thick peristome and closely-wound 
whorls.” 
ALYCEUS DAMSANGENSIS, n. sp. (Plate XLIII. figs. 3, 3a, 3b, 3c.) 
Locality. Damsang Peak, Western Bhutan Hills (JV. Robert). 
Shell turbinate, very closely umbilicated ; sculpture, well-marked 
distant costulation on the upper whorls, coarse, close, regular on the 
enlarged portion of the last; colour dull, very pale ochraceous ; 
spire high, conic, apex blunt; suture moderately impressed, tube 
mediocre ; whorls 4, the last sharply constricted at base of the 
sutural tube, then enlarging suddenly into a recurved ridge, suc- 
ceeded by a depression, and then another shorter ridge, and a pit- 
like depression in front of it ; aperture oblique ; peristome double, but 
not thickened ; columellar margin straight, subvertical, with slight 
notch below ; operculum multispiral, brown. 
Size: major diam. 3:8, alt. axis 3-2 mm. 
ne Olds 04. 0-L3daneh. 
This shell assimilates somewhat, in the character of the constric- 
tion and the expansion of the whorl anterior to it, to A. hebes, Bs. ; 
but in the irregular wrinkled portion in advance of the main ridge 
crossing the swollen part it differs very materially, and presents a 
most interesting approach to A. notatus, G.-A., of the Dafla 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. 
ALYCHUS CHENNELLI, n. sp. (Plate XLVIII. fig. 2.) 
Locality. Piknti, Naga Hills (Chennell). 
Shell globosely turbinate, umbilicated, but very closely, as a narrow 
sht; sculpture, smooth near apex, distant costulation developed 
bey ail and strongest near suture; colour white; spire conic, high, 
apex rounded; sutural tube long, fine; whorls 4, rounded, con- 
striction short and close to the base of the sutural tube, then 
