MACROCHLAM IS. 1 19 



of 40 . 2 . 9 . 1 . 9 . 2 . 40 (51 . 1 . 51) teeth. The median tooth is 

 tricuspid ; the aclmedians have each a single cusp on the outer 

 side ; the marginals are minute and bicuspid. The genitalia could 

 not be made out.] 



Major diam. 13|, min. 12, height 9 mm. 



Hob. Near Moulmein (Theobald) ; Phaboo, Salwin Valley 

 (Hung erf o rd). Common in the Upper Menam Valley and around 

 Ching Mai in Siam. 



There is some variation in size and in the height of the spire : 

 a small Burmese specimen measures 12, 11, and 7| mm. in its 

 three diameters, a large Siamese shell 15, 13|, and 9. The 

 species is easily distinguished from all other Burmese and Indian 

 Macrochlamys by its great height compared with its diameter. It 

 is impossible to identify it with Albers's Nanina cycloidea, which 

 measured 20 mm. in major diam. by only 9 in height, and which 

 was of unknown origin, though supposed to be Himalayan. 



b''. Depressed or conoidly depressed. 

 b"'. Smooth. 



186. Macrochlamys subpetasus, Godwin-Austen (Nevill, MS.), Mol. 



2nd. i, 1888, p. 211, pi. 53, fig. 7 (shell). 

 Helix aspides?, Blf. (nee Bs.) J< A. S. B. 1865, pt. 2, p. 86. 



Shell minutely and subobtectly perforate, convexly depressed, 

 polished, smooth, without sculpture, light brown ; spire low, con- 

 vexly conoidal, suture slightly impressed; whorls 6, convex, 

 increasing slowly, the last rounded at the periphery, convex 

 beneath ; aperture subvertical, lunate ; peristome thin above, 

 basal margin slightly obtuse, columellar oblique, much curved, 

 slightly expanded, more so near the perforation. 



Major diam. 8, min. 7|, height 4 mm. 



Hab. Arakaii Hills on west side near Tongoop, and Bassein 

 District, Pegu, west of Basseiu River. Common. 



187. Macrochlamys noxia, Blf. P.Z.S. 1904, ii, p. 444, pi. 25, fig. 14. 



Shell minutely and subobtectly perforate, depressed, thin, 

 smooth, polished, without sculpture, rufesceut brown (light 

 chestnut), whitish beneath except near the periphery ; spire very 

 low, conoidal, suture impressed ; whorls 6, convex, not increasing 

 rapidly, the last rounded at the periphery, convex beneath ; 

 aperture slightly oblique, lunate ; peristome thin, basal margin 

 arcuate, columellar oblique, briefly reflected above. 



Major diam. 9, min. 8, height 4 mm. A large shell measures 

 10x9x4j. 



Hab. Bassein District, Pegu, west of Bassein Eiver. 



A variety from Akyab in Arakan has 5 whorls and a slightly 

 higher spire. 



This is distinguished from M. Tiypoleuca by being more depressed 

 and more narrowly perforate, and by the complete want of 

 sculpture, and from M. subpetasus by larger size, lower spire, &c. 



