MOLLUSOA OF INDIA. 13] 
53, sensim accrescentes, primi planulati, ultimi convewiusculi, ultimus 
haud descendens, subtus convewus, modice inflatus, sed infra carinam, 
nisi jucta aperturam, leviter compressus. Apertura obliqua, angulato- 
* lunaris, intus livido-albida ; peristoma acutum, mntus subincrassato- 
labiatum, marginibus callo tenui junctis, columellari curvato, breviter 
reflexo. 
‘Diam. maj. 32, min. 29, axis 17 mm. Apert. 163 mm. lata, 
133 oblique alta. 
** Hab. In montibus ‘ Burail Range’ dictis, ad alt. 3000-4000 
pedum, in provincia ‘ North Cachar’ Bengalie orientalis (H. H. G'od- 
win- Austen). 
“Shell perforate, depressed, carinate, not very thin, having a 
greasy lustre and a thick epidermis, tawny or yellowish brown, marked 
with oblique raised strie of growth decussated by fine, subdistant, 
spiral impressed lines above (the nucleus almost smooth), and with 
fainter radiating strie and concentric impressed lines below. Spire 
but little raised, almost convex, depressly conoid ; apex obtuse ; 
suture linear at first, but slightly impressed near the mouth. Whorls 
53, gradually increasing, the inner nearly flat above, the outer 
slightly convex, the last not descending, convex and moderately 
swollen below, but slightly compressed just below the keel, except 
near the mouth. Aperture oblique, angulately lunate, a little broader 
than high, pale livid within. Peristome sharp, with a slightly 
thickened lip inside, the margins joined by a thin callus ; columellar 
margin curved, reflected for a short distance at the perforation. 
Major diameter 1°26 inch, minor 1:14, axis 0°69, breadth of aper- 
ture 0°65, height (measured obliquely) 0°53. 
‘There is a very remarkable resemblance between this shell and 
that described by me as Nanina koondaensis (J. A. 8. B. 1870, 
xxxix. pt. 2, p. 16, pl. iil. fig. 12), yet I am by no means sure that 
both belong to the same section or subgeneric group. NV. koonda- 
ensis is an ally of WV. indica ( Pfr.) and WV. shiplay?, shells doubtless 
nearly allied to Hemiplecta, and very possibly belonging to that sub- 
genus, but hitherto referred to Rotula*, or to other sections. O. 
sylvicola is larger, more solid, and covered with a distinct epidermis, 
and the sculpture is less granulate above, the spiral impressed lines 
being more distant. 
“‘T have seen but one specimen of O. sylvicola, for which I am 
indebted to Col. Godwin-Austen, Other specimens, I learn, are 
larger.” 
On measurement, however, my largest specimen from Kigwemah 
in the Anghami-Naga Hills is very little larger, being 
Major diam. 33-0, minor 30°5, alt. axis 15-5 mm. 
x 1s (Uae WAR Loa gas 0°61 inch. 
* “ Stoliczka, J. A. S. B. 1871, vol. xl. pt. 2, p. 231.” 
