84 Contributions to Indian Malacology. [No. 2, 



for a short distance with close fine costulation, which extends beneath 

 to the umbilicus and renders the shell opaque in that spot. Constric- 

 tion long, smooth, swelling considerably in front towards the mouth. 

 Sutural tube short, about J- to ^ of the periphery of the penultimate 

 whorl. Aperture oblique, circular, deeply sinuate at the junction 

 with the penultimate whorl, and at the lower right margin ; peristome 

 double, the inner lip projecting and continuous, outer lip retrorelict. 

 Operculum horny, multispiral, externally concave. 



Millem. inch. 



Major diameter, 3 0.12 



Minor ditto, 2| 0.09 



Axis, li 0.05 



Habitat — Phoung do, near Cape Negrais, Arakan. 



Very near A. humiUs, W. Blanf., from Pegu, but distinguished by 

 its lower spire, wider umbilicus, more sinuous mouth, and especially by 

 its high polish, in which it is only equalled by A. nitidus, W. Blanf. 



27. A. glaber, m sp. 

 Shell broadly umbilicated, conoidly depressed, solid, reddish white, 

 the upper whorls darker, rather dull in lustre, smooth, except at the 

 swollen portion of the last whorl, which is very finely and closely 

 costulated. Spire depressly conoid ; apex rather obtuse ; suture im- 

 • I. Whorls 4, convex, the last obsoletely subangulate at the 

 periphery, moderately swollen at the side, then constricted, descending 

 a little near the mouth. Constriction of moderate length, smooth, 

 Blightly swollen in the middle. Sutural tube of moderate length. 

 Aperture diagonal, circular ; peristome more or less distinctly duplex, 

 thickened, moderately expanded. Operculum dark coloured, horny, 

 externally concave, internally convex, with a prominent central nucleus. 



Millem. inch. 



Major diameter, 7| 0.30 



Minor ditto, 6 24 



Axis, 4| 0.18 



Habitat — Akyab, Arakan; the hills south of the harbour. 



Tli is species closely resembles A. Tngrami, W. Blanf., for which I 

 for some time mistook it, but it is distinguished by the absence of any 

 sculpture on the upper whorls, and also by the more oblique mouth. 



