MAC3JOCHLAMY.S. 121 



whorls 5, not increasing rapidly, convex, the last rather broader, 

 rounded at the periphery, convex beneath ; aperture slightly 

 oblique, broadly lunate; peristome acute, basal margin faintly 

 arcuate, colurnellar margin curved, vertical and reflected above. 



Major cliam. 12, min. 10|, height 6 mm. 



Hat. Pegu, the types from Akoutoung on the Irrawady below 

 Prome ; also found at Thayetmyo, and according to Nevill at 

 Bhamo. 



Easily recognized by its peculiar coloration. The sculpture is 

 often obsolete on the upper surface, but can generally be seen 

 beneath by the help of a microscope. 



191 . Macrochlamys spreta, Elf. P.Z. S. 1904, ii, p. 445, pi. 25, fig. 12. 



Shell minutely and subobtectly perforate, depressed, thin, 

 smooth, polished, finely striated with microscopical spiral (longi- 

 tudinal) impressed lines above and below ; light rufescent brown 

 (pale chestnut), whitish at the base around the perforation ; spire 

 low, conoidal, suture shallow; whorls 5, convex, the last rather 

 broader, rounded at periphery, convex beneath ; aperture oblique, 

 subovately lunate ; peristome thin, straight, columellar margin 

 oblique, slightly reflected. 



Major diam. 8, min. 7, height 3| mm. 



Hob. Thamandewa, Bassein District, and other places west of 

 the Irrawady River in Pegu. 



This resembles M. hypoleuca and M. noxia in colour and form, 

 but is distinguished by its marked longitudinal sculpture as well 

 as by its smaller size. 



[192. Macrochlamys andersoniana, Nevill. 



Nanina honesta, var. andersoniana, Nevill: vide Appendix to 



Genus, p. 141. 

 M. honesta, var. tenuior, Nevill, MS. : vide Appendix, p. 141.] 



[Macrochlamys honesta, Gould, which was inserted here in 

 , Dr. Blant'ord's MS., is placed in a new subgenus.] 



193. Macrochlamys patens, Elf. P. Z. S. 1904, ii, p. 445, pi. 25, fig. 15. 



Shell narrowly but perspectively umbilicate, conoidly depressed, 

 sublenticular, smooth, polished, marked with parallel microscopic 

 spiral (longitudinal) impressed lines, not close together, but at 

 irregular intervals, above and below, taw r ny brown ; spire conoidal, 

 suture slightly impressed ; whorls 44, convex, the last rather 

 broader, bluntly angulate at the periphery, convex beneath, com- 

 pressed around the umbilicus ; aperture diagonal, subtrapezoidal, 

 almost securiform ; peristome thin and straight, columellar margin 

 oblique, triangularly reflected. 



Major diam. 7, min. 6, height 3| mm. 



Nab. Irrawady Valley, Pegu ; Thayetmyo, Bassein. 



In many respects this shell resembles M. Jionesta, but is 



