1865.] Contributions to Indian Malacology. 67 
Millem. inch. 
Major diameter, ............... 11} 0.46 
J G8 TG 10 0.40 
OO Ne Lees 6 0.24 
Aperture 6 millem. broad, 43 high. 
Habitat—Akoutoung on the Irawady, below Prome, Pegu. 
This species may be distinguished from its numerous allies of the 
Macrochlamys section by its blunt angulation at the periphery and its 
dull lustre. Its nearly vertical mouth amply serves to shew its dis- 
tinction from N. honesta, Gould, which shell moreover is more polished, 
and differs in several other particulars. 
3. N. HypoLEvca, n. sp. 
Shell openly perforated, depressed, very thin, smooth, polished, 
horny; dark brown above; lighter, frequently white below; faintly 
striated, obliquely above, radiately below, with extremely fine con- 
centric microscopic markings, which are frequently obsolete. Spire 
very little raised; apex rather obtuse; suture impressed, sometimes 
sub-marginate. Whorls 5, rather convex above; the last rather 
broader, rounded beneath, not descending. Aperture lunate, the 
breadth exceeding the height, nearly vertical; peristome acute, 
straight ; columellar margin descending with an oblique curve, scarcely 
reflexed. 
Millem. inch. 
Major diameter,................++ 12 0.48 
0G 2 LOR 0.42 
a ae 6 0.25 
Habitat—Akoutoung, Pegu. Scarce. 
Near NV. causia, Bs., but larger, more depressed, and with far finer 
microscopic spiral sculpture ; so fine indeed that it is difficult of detec- 
tion even under a powerful microscope. H. hypoleuca may be re- 
cognised by its pale base, and dark horny colour above, and by its open 
perforation. 
A small form, perhaps identical with the above, but only 5 or 6 
millemetres in diameter, is common in northern Pegu. I had con- 
founded it with N. causia, Bens., but Mr. Benson informs me that 
