124 ZONITID^. 



198. Macrochlamys ? pauxillula, B. (Helix) A. M. N. H. (3) iii, 

 1859, p. 390 ; Pfr. (Helix) Mon. Hel. v, 1868, p. 119 ; ? H. $ T. 

 (Helix) C. I. 1876, pi. 90, figs. 7, 8, 9 ; JNevtil, Nanina (Micro- 

 cystis), Hand-l i, 1878, p. 37. 



Shell perforate, depressed, thin, brownish horny, polished, 

 marked with close, very fine, longitudinal (spiral) lines above 

 and below ; spire convex, suture impressed ; whorls 4, convex, 

 regularly increasing, the last rounded at periphery and below ; 

 aperture oblique, broadly lunate ; peristome thin, straight, colu- 

 mellar margin curved, expanded and carried slightly forward 

 above. 



Major diam. 2|, min. 2 j, height 1J mm. 



Hob. Thayetmyo, Pegu (Theobald, W. T. B.) ; Prome. 



The specimens described above, though somewhat larger, agree 

 with Benson's description and are from the same locality. The 

 shell figured in the ' Conchologia Indica ' looks different, and may 

 be M. curvilabris. 



Another form, also from Thayetmyo, is thicker ; it has a 

 higher, more convex spire, and stronger concentric striation. 

 This may be regarded as a variety. 



F. Species from Andaman and other Islands in Bay of Bengal, 

 a. Depressed. 



199. Macrochlamys choinix, Bs. (Helix) A. M. N. H. (3) vii, 1861, 

 p. 83 ; Pfr. (Helix) Mon. Hel. v, 1868, p. 117 ; H. $ T. (Helix) 

 C. 1. 1876, pi. 51, fig. 1 ; Godwin-Austen, Mol. 2nd. i, 1883, p. 102, 

 pi. 22, fig. 6 j ii, 1898, p. 48 ; id. A. M. N. H. (6) ii, 1888, p. 57. 



Shell obtectly perforate, depressed, thin, translucent, scarcely 

 striated, smooth, with fine, close, spiral (longitudinal) lines, only 

 visible under a strong lens, on the upper surface, brownish horny ; 

 spire very low, suture scarcely impressed, almost flat ; whorls 5, 

 flat above, the inner rather closely coiled, the last broader, sub- 

 angulately rounded at the periphery, moderately convex beneath ; 

 aperture oblique, large, broadly lunate; peristome sharp, upper 

 margin arcuate, columellar much curved, vertical above and briefly 

 reflected, partly covering the perforation. 



Major diam. 16, min. 14, height 7 mm. 



Hab. Mount Harriet, South Andaman. 



Distinguished by few whorls, much broader last whorl, and 

 the flattened upper surface. The animal, according to Nevill, is 

 very active and throughout black, except the sole of the foot, 

 which is white. 



Macrochlamys choinix, var. gigantea, Nevill (G.-A., P. Z. . 

 1895, p. 446 ; Mol. Ind. ii, p. 48), from South Andaman Island, 

 has never been described. 



