
1865.] Contributions to Indian Malacology. 71 
at the periphery, the keel vanishing near the mouth. Aperture lunate, 
oblique, breadth more than double the height ; peristome thin, curved 
forwards at the base ; margins distant, columellar oblique. 
Millem. inch. 
Major diameter,.............. weld 11 0.44 
bpliMOn ditto: 2. odeccai feveise. swe 10 0.4 
Becta, tvs stint. er dash ‘ 74 0.3 
Aperture 5} millem. broad, 2 high. 
Habitat—Southern portion of the Arakan range. of hills near 
Bassein and Cape Negrais. 
This shell is distinguished from N. mamillaris by its non-acuminate 
apex, higher spire and more conyex base, and from N. helici/era by 
the absence of the columellar lamina, of which no trace appears in 
the present species. It appears to replace the last named shell in the 
southern portion of the Arakan hills. It is scarce, and I have met 
with but few specimens in good condition. Ihave never seen the 
animal, which, however, is doubtless similar to those of the two preced- 
ing species, 
Section T'rochomorpha, 
8. N. coNFINIS, n. sp. 
Shell minutely perforated, trochiform, very thin, whitish horny, 
smooth, shining. Spire conical, apex slightly obtuse, suture scarcely 
impressed. Whorls 7, flatly convex, marked above with 4 or 5 spiral 
ribs and fine oblique lines of growth; the last sharply keeled, flatly 
convex beneath, and very finely radiately striated. Aperture oblique» 
subrhomboidal, twice as broad as high; peristome thin, acute, straight ; 
margins distant, columellar subvertical, briefly and triangularly reflexed, 
Millem, inch, 
Major diameter,...........0... Ls 103 0,42 
Minor Gittoy sc Tete eee 94 0.88 
BSISP WII) LI QRE. a fl 0.28 
Aperture 5 millem. broad, 23 high. 
Habitat—near Thayet Myo, on the borders of British Burma; also 
near Ava. 
A near ally of N. arx, Bens., from Tenasserim, which, however, 
may easily be recognised by the concave sides of its spire. From other 
