72 Contributions to Indian Malacology. [No. 2, 



related species, as N. infula, Bens., N. cacuminifera, Bens., and N. 

 attegia, Bens., N, confinis is distinguished by its sculpture. 

 9. N. culmen, n. sp. 

 Shell very minutely perforated, trochiform, veiy thin, homy, trans- 

 lucent. Spire conical, apex obtuse, suture impressed. Whorls 6, convex 

 above and ornamented with fine raised spiral lines, and oblique stria? ; 

 the last Avhorl sharply keeled at the periphery, not descending, 

 swollen and minutely decussately striated beneath. Aperture but 

 little oblique, subquadrately lunate ; height less than the breadth ; 

 peristome simple, thin ; margins distant, columellar vertical, slightly 



reflexed above. 



Millem. inch. 



Major diameter, ,.,...... 5f 0.23 



Minor ditto, 5J 0.21 



Axis, 5J 0.22 



Aperture 3 millem. broad, 2 high. 



Habitat — Akoutoung and banks of the Tsanda Khyoung, Henzada 



district, Pegu. 



Easily distinguished from N. confinis and N. atUgia by its smaller 



size and higher spire ; from N. arx, by the sides of the spire being 



straight and not concave, and from the Bengal N. infula, Bens., by 



its sculpture, and its sharper keel. 



10. N. GRATULATOR, 11. Sp. 



Shell perforated, turbinate, thin, whitish horny. Spire conical ; 

 apex obtuse ; suture impressed. Whorls 5, slowly and regularly in- 

 creasing, convex, spirally lirate and marked with oblique stria? of 

 growth above ; the last whorl keeled at the periphery, convex and 

 decussately marked with concentrfc and radiating stria? below, not 

 excavated around the perforation. Aperture diagonal, subtrapezoidal, 

 breadth exceeding the height ; peristome thin ; margins distant, united 

 by a callus ; basal deeply sinuate ; columellar vertical, forming a right 

 angle with the basal, and briefly triangularly reflexed above ; reflexed 

 portion thickened and passing half round the perforation. 



Millem. inch. 



Major diameter, 5 0.2 



Minor ditto, 4| 0.18 



Axis, 4 0.1& 



