
1865.] Contributions to Indian Malacology: 79 
apex obtuse; suture impressed, subcrenulate. Whorls 63, slightly 
convex ; the last ascending a little towards the mouth, and exceeding 
4 of the shell in length. Aperture vertical, truncately semicircular ; 
peristome obtuse, slightly thiekened; margins joined by a callus; 
columella very much curved, projecting forwards at the base, subver- 
tically truncated within the peristome. 
Millem. inch, 
CHUN RSS Re een get Pt i 0.28 
MENGE OTIC sc chic dicaidla as acdene 34 0.14 
Length of aperture, ............ 2} 0.11 
Habitat—Irawady valley, Pegu : common: 
A pretty little species, darker in colour than any of its allies, except 
perhaps A. gemma, Bens., and easily distinguished from all, by the 
columella being more arcuate,.also by its more acuminate spire and 
blunter apex, and its much stronger sculpture. 
20.. A. PERTENUIS, 0. sp: 
Shell very slender, turrited, thin, light horny, polished, closely, 
minutely, and rather irregularly striated. Spire subulate; somewhat 
acuminate towards the blunt apex; suture impressed, subcrenulate. 
Whorls 11—12, convex, the last about + the length of the spire. 
Aperture oblique, ovately pyriform, peristome thin, margins united. by 
a thin. callus, columella moderately curved, obliquely truncated, 
Millem. inch. 
MON BEN, .. see versqnethiwesonisav st 20 0.8 
Bram GET) ts. bo- ckigiecl wcinilet owleled ei 4} 0.18 
Length of aperture, .........00 4 0.16 
Habitat—Tongoop, Arakan. 
Var major, length 264 millem.; diameter 6 ; length of aperture 6. 
Of another specimen; length 23 millem.; diameter 5%; length of aper- 
ture 54. P 
Habitat—Pyema Khyoung, Bassein district, Pegu. 
A much more slender species than A. tenwispira, Bens., (a variety of 
which also abounds in parts of Pegu,) though there are signs of a 
passage. The present.appears to replace A. tenuispira in Arakan and 
Bassein. Mr. Benson, to whom I sent a specimen, observes that it is 
intermediate between A.. tenwisprra and A. hastula, Bens. 
