108 LAND AND FRESHWATER 
Shell very thin, umbilicated, depressedly conoid, flattish on base ; 
sculpture very deep, regular, longitudinal stri, crossed by numerous 
fine lines of growth (Plate XXI. fig. 5); colour dark horny ; spire 
low, apex blunt; suture moderately defined ; whorls 7, flat above, 
periphery rounding suddenly ; aperture ovate ; peristome straight 
above, sinuate below, slight reflexion and very oblique near 
umbilicus. 
Size: maj. diam. 23:0, min. 19-8: alt. axis 8-0, body-whorl 6°5 mm. 
3 O61, . “0-763, _.,. . 0:32, # 0-26 inch. 
This is a very distinct large species, unlike in its form, thin texture, 
and sculpture the many other closely allied forms. 
MacrocHLAMyYs OPIPARUS, n. sp. (Plate XXIII. figs. 6, 6 a.) 
Locality. Darjiling. 
Shell globose, subconoid above, umbilicated, rather solid ; sculp- 
ture above with minute, irregular, transverse lines of growth; roughly, 
coarsely, and unevenly striate longitudinally ; colour dull ochre, 
with a pale brown band bordering the peristome ; spire, apex blunt ; 
suture impressed ; whorls 6, convex, the last well rounded on the 
periphery and much swollen; aperture globosely lunate, subvertical; 
peristome thin, straight, subvertical on the columellar margin and 
slightly reflected near umbilicus. 
Size: major diam. 16°7, minor diam. 14-0, alt. axis 7-0 mm ; 
ms 0-66, 4s 0°56, ,,. 0:28 inch; 
alt. body-whorl above the columellar margin 5-8 mm. 
” ” ” 0:23 inch. 
MacrocHLaMys KALA, n.sp. (Plate XL. figs. 1, la, 1 5.) 
Locality. Damsang Peak, Daling Hills, Western Bhutan (W. 
Robert). 
Shell closely perforate, depressedly conoid, base flat, thin, trans- 
parent, glassy; sculpture fine, regular longitudinal striae (similar to 
figs. 9, 10, Plate XXI., rather coarser); colour very pale ashy 
ochre ; spire flatly conoid ; whorls 5, slightly convex above ; aperture 
subvertical, lunate; peristome circular on outer margin ; columellar 
margin subyertical, weak. 
Size: maj.diam.9°0, min. 7:0; alt. axis 3°5, body-whorl 2°5 mm. 
5 O36; 4° 0255, 4, Os, % 0-10 inch. 
The animal may be distinguished at once by its very dark colour 
above, contrasting with the light colour of the pedal margin and sole 
of the foot below. It is a true Macrochlamys, with the usual right 
and left shell-lobes present (Plate XL. figs. 2, 3,4). The left dorsal 
is divided into an anterior and posterior lobe. 
The generative system (fig. 5) is wanting in the usual amatorial 
organ, and the male organ is more simple than in M. indica and 
thout the coiled cecum. The spermatophore is beautifully dis- 
played in most of the specimens I have examined, both in course of 
formation within the male organ (fig. 6) and also where it has been 
received into the spermatheca (fig. 7). At its posterior portion it is 
