1865. ] Contributions to Indian Malacology. 85 
Gunus DIPLOMMATINA. 
28. D. NANA, n. sp. 
Shell not rimate, dextrorse, subovate, rather solid, amber-coloured, 
very finely and closely filiformly costulated on the lower whorls, less 
closely on the upper, or, frequently, subdistantly costulated through- 
out. Spire conical, with sides scarcely convex above; apex rather 
obtuse, sometimes reddish, suture impressed. Whorls 6—63, rounded, 
antepenultimate the largest, the last rising considerably upon the 
penultimate. Aperture vertical, ear-shaped, nearly circular, columellar 
margin straight for a short distance and vertical, with an internal 
tooth. Peristome double, both portions expanded and appressed, the 
inner forming a thin callus upon the penultimate whorl. Operculum ? 
Millem. inch. 
11 ULE ee 2} 0.09 
Diameter, ........ Seba Ny cei ee 1 0.04 
Aperture with peristome about 2 millem. in diameter. 
Habitat—Akoutoung, Thondoung and Yenandoung in Henzada 
district, Pegu. 
This species approaches D. polyplewris, Bens., more nearly than 
any other. It is distinguished by its more regularly ovate form, 
blunter apex, less swollen penultimate whorl, and more marked and 
distant sculpture. The latter character, however, varies. The 
specimens from Thondoung, a hill about 20 miles south of Akoutoung, 
being either closely costulate throughout, or subdistantly sculptured 
above, closely below; while in Akoutoung specimens, the costulation 
is subdistant throughout. As, however, I can trace no other distinc- 
tion between the shells, and the costulation varies in different indivi- 
duals from each place, I do not think there is any specific distinction. 
A still more minute species than the present exists in Pegu, and 
I found two dead specimens at the base of the Arakan hills in the 
Henzada district. As these specimens were not very well preserved, 
LT abstain from describing them for the present. 
Family Helicinide. 
Genus HELICINA. 
29. H. ARAKANENSIS. 
Shell depressly turbinate, sublenticular, rather thin, obliquely striated 
above, radiately and very minutely beneath, polished, flesh-coloured, 
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