246 ZONITID^E. 



Shell imperforate, conoidly depressed, rather solid, tawny 

 whitish on the periomphalus below, transversely costulate, the 

 ribbing disappearing at the apex, and also on the whitish portion 

 of the lower surface, though continued below the periphery ; 

 spire low, conoid, suture impressed ; whorls 7-7|, narrow, the 

 last descending a little close to the aperture, subangulate to 

 angulate at the periphery, convex beneath, slightly hollow in the 

 middle ; aperture oblique, narrow, curved, contracted by a thick 

 parietal lamella, and by another palatal inside the peristome, 

 extending from its external angle to its columellar insertion ; 

 peristome white, thickened. 



Major diam. 9, min. 8, axis 5 mm. 



Hob. Farm Caves, Moulmein. 



A shell with a remarkable aperture, resembling that of the 

 North- American Helix hirsuta ? 



The foot is very narrow, the posterior portion especially so, and 

 it is truncated behind. There is a small mucous pore and a small 

 lobe above it. The mantle-lobes are short, not extending over 

 the surface of the shell. Upper tentacles long, lower short. 



c. Aperture edentulous. 



373. Sesara helicifera, W. T. Blanford (Nanina), J. A. S. B. 1865, 



p. 68; Pfr. Mon. Hel. v, 1868, p. 241 ; H. $ T. C. I. 1876, 

 pi. 50, figs. 3, 4. 



Shell imperforate when adult, but with a deep umbilical hollow, 

 perforate in the young, turbinate, rather thin, horny, fulvous, 

 finely, closely, subarcuately, and obliquely costulate above, the 

 costulation passing over the periphery and merging into radiating 

 striations on the lower surface, which is smooth and polished ; 

 spire conoid with convex sides, apex obtuse, suture impressed ; 

 whorls 7|, closely wound, convex above, the last angulate at the 

 periphery (keeled in the young), flatly convex beneath, with one 

 or more irregular indentations, mostly opaque white from internal 

 callus, at a distance of half a whorl from the mouth ; aperture 

 oblique lunate, about twice as broad as high, with a spiral lamina 

 on the columellar margin, extending into the whorls ; peristome 

 simple, basal margin slightly arcuate, columellar oblique. 



Major diam. 10, min. 9, axis 7 mm. 



Hob. Arakan Range west of Prome, Burma. 



Animal dark above, almost black, sole paler. Mucous pore very 

 small, but with a lobe above. 



374. Sesara mamillaris, W. T. Blanford (Nanina), J. A. 8. B. 1865, 



p. 69; Pfr. Mon. Hel v, 1868, p. 88; H . fy T. C. I. 1876, 

 pi. 50, figs. 1, 2 ; Nevill, Hand-l. i, 1878, p. 54. 



Similar to S. helicifera, except that the base is perforate and the 

 columellar lamina and indentations on the lower surface are 

 wanting in adults, though they are found in young shells, also 



