MACEOCHLAMYS. 83 



outer side below the point ; this cusp becomes rapidly very minute, 

 and towards the margin the teeth are nearly aculeate, only a very 

 minute notch indicating the cusp.] 



121. Macrochlamys mainwaringi, Godwin-Austen (G. Nevill, MS., 



Bensonia ?), J. A. S. B. 1882, p. 69, pi. 5, tig. 3 (auinial) ; Blf. 

 Proc. Mai. Soc. iv, 1901, p. 182. 



Helix celox, Theobald (Bs. MS.}, J.A.S. B. xxxii, 1863, p. 365 (no 

 description). 



Shell perforate, subturbinately depressed, pale fulvous, thin, 

 horny, translucent, dull and not polished above, striated obliquely 

 and minutely decussated with spiral impressed lines, which disappear 

 on decortiated shells, smoother and' polished beneath ; spire de- 

 pressedly conical, suture slightly impressed; whorls 6-7, regularly 

 increasing, the last rounded at the periphery; aperture moderately 

 oblique, broad, lunate; peristome sharp, with a white labiation 

 inside, similar labiation, marked by white bands, often found in 

 the last whorls, marking the position of peristomes formed during 

 growth. 



Major diam. 27, min. 23-5, height 15-5 mm. 



Hob. Sikhim : Darjiling, about 7000' ; Kursiong. 



Immature individuals often have a thin portion of the last 

 whorl extending beyond the labiate peristome, which has evidently 

 been formed during a period of rest, probably the winter. 



The animal, as shown in Stoliczka's drawing figured by Godwin- 

 Austen, is dull brick-red in colour, with a well-marked horn-like 

 projection above the mucous pore. No shell-lobes are shown, but 

 this may be due to their being small and inconspicuous. At the 

 same time the lobes may be wanting, in which case this species 

 should probably be referred to Bensonia. 



122. Macrochlamys dalingensis, Godivin-Austen, Mol. Ind. i, 1883, 



p. 121, pi. 35, figs. 1-10 (shell and anatomy) ; Blf. Proc. Mai. Soc. 

 iv, 1901, p. 180. 



Very similar to M. mainwaringi, but thinner, darker, and with 

 the last whorl less tumid beneath the periphery, consequently the 

 'aperture is not so high ; the sculpture too is rather stronger, con- 

 sisting of fine, close, almost subcostulate stria3, decussated by fine 

 impressed lines ; the stria3 nodose or papillate under the microscope 

 between the intersections. The labiation inside the aperture 

 appears to vary and is occasionally wanting. 



Major diam. 24, min. 21, axis 12-5 ? mm. 



Hob. Damsang, Daling Hills, Bhutan Duars, about 6000'; 

 Sikhim, Singtam, about 5000'. 



Animal pale-coloured (in spirits) ; shell-lobes both present, but 

 not large. Eadula normal, formula : 45 . 2 . 14 . 1 . 14 . 2 . 45 ; 

 marginals almost simple, becoming unevenly bicuspid as they 

 approach the admedian teeth. [In the generative organs the coiled 

 caecum is well seen, the epiphallus meeting the head of the penis 

 close to and on side of it.] 



