MA.CBOCHLAMYS. 117 



flab. Pegu; Thayetmyo ; Upper Burma. Tsingu near Ava 

 ( W. T. B.). 



This species resembles M. subjecta (p. 98), but is distinguished 

 by being more lustrous and globose, and by its narrower last 

 whorl and smaller mouth, as well as by its longitudinal striation, 

 which is sometimes difficult of detection. 



a''. Longitudinally (spirally) striated. 



182. Macrochlamys kumahensis, Theob. fy Stol. J. A. S. B. 1872, 



p. 334, pi. 11, figs. 9, 10 : Pfr. (Helix) Mon. Hel. vii, 1876, p. 531 ; 

 Nevill (Nanina), Hand-I. i, 1878, p. 25. 

 Nauina ramriensis, i?^'., Nevill, Hand-l. i,1878, p. 24 (no description). 



Shell openly perforate, depressed (almost subglobose), thin, 

 smooth, polished, with close, minute, longitudinal (concentric) 

 striation, only visible under a microscope, above and below, 

 yellowish to brownish tawny ; spire low, suture rather well im- 

 pressed ; whorls 4|, convex, subangulate outside the suture ; the 

 last considerably broader, well rounded at the periphery and 

 rather tumid below ; aperture oblique, roundly lunate, almost 

 circular ; peristome thin, straight, columellar margin much curved, 

 becoming vertical above, and rather broadly triangularly expanded. 



Major diam. 9|, min. 8^, height 5| mm. 



The form named ramriensis (but never described) is slightlv 

 larger, measuring 10| mm. in diameter, and has a rather larger 

 mouth, but, as suggested by Nevill, is not distinguishable. 



Hab. Kumah Hill near Sandoevay, Arakan (Theobald) ; R-ainri 

 Island, Arakan coast (W. T. B.). Also recorded from Bhamo, 

 the Dana Hills, and Borpani, Assam, with doubt by Nevill. [These 

 are different species.] 



A well-marked species, somewhat resembling M . subjecta in shape. 



183. Macrochlamys causia, Bs. (Helix) A. M. N. H. (3) iii, 1859, 



p. 388 ; Pfr. (Helix) Man. Hel. v, 1868, p. 118 ; H. $ T. (Helix) 

 C. L 1876, pi. 90, figs. 2, 3; Nevill, Nanina (Microcystis), 

 Hand-l. i, 1878, p. 36, no. 142 [from Salwin River is the next 

 species]. 



Shell perforate, subglobosely depressed, rather solid, obliquely 

 striated and, under the microscope, marked with minute, close, 

 spiral (longitudinal) lines, smooth, not highly polished, pale 

 yellowish horny, whiter beneath ; spire conoidal, apex obtuse, 

 suture impressed ; whorls 5, convex, the last considerably 

 broader, rounded at the periphery, moderately swollen beneath ; 

 aperture large, oblique, roundly lunate ; peristome thin, straight, 

 columellar margin vertical, produced forward around the per- 

 foration and sharply reflected. 



Major diam. 6|, min. 5|, height 4 mm. 



Hab. Phiethan, Tenasserim Valley (Theobald)-, Salwin Eiver 

 (Hungtrford) teste Nevill). 



