MACBOCHLAM VS. 1 19 



of 40 . 2 . 9 . 1 . 9 . 2 . 40 (51 . 1 . 51) teetli. The median tootli is 

 tricuspid ; the iidmedians liave each a siugle cusp on the outei- 

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

 not be made out. | 



Major diani. I'd.], min. 12, height 9 mm. 



Hub. Near ]\loulmein (Theobald) ; Phaboo, Halwiu Vallev 

 {Hnngerford). Comuion 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 7g mm. in its 

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

 species is easily distinguished from all other Burmese and Indian 

 Macrocldaimjs by its great height compared with its diameter. It 

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

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

 was of uukuow n origin, though supposed to be Himalayan. 



b". Depressed or conoidhj depressed. 



b'". Smooth. 



186. MacrOChlamys Subpetasus, Godwin-Austen {Xevilt, MS.), Mol. 



hid. i, 1888, p. 211, pi. 53, tio-. 7 (shell). 

 Helix aspides?, Blf. (nee Bs.) J. A. S. B. 18G5, pt. 2, p. 8(3. 



Shell minutely and subobtectly perforate, convexly depressed, 

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

 vexly conoidal, suture slightly impressed ; whorls 6, cou\ex, 

 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. Tg, height 4 mm. 



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

 District, Pegu, west of Bassein liiver. Common. 



187. Macrochlaniys noxia, Blf. P.Z.S. 1904, ii, p. 444, pi. '25, tig. 14. 



Shell minutely and subobtectly perforate, depressed, thin, 

 smooth, polished, without sculpture, rufescent 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 retiected above. 



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

 10x9x4.i. 



Hub. Basseiu District, Pegu, west of Bassem Kiver. 



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

 higher spire. 



This is distinguished from M. hypolenca by being more depressed 

 and more narrowly perforate, and by the complete want of 

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



