6 ZONITID^. 



b f . Depressed. 

 a 2 . Spirally (longitudinally) sculptured. 



126. Macrochlamys sequax, Bs. (Helix) A. M. A. H. (3) iii, 1859, 

 p. 270; Pfr. (Helix) Mow. Hel. v, 1868, p. 118; H. Sf T. 

 (Helix) (7. 2. 1876, pi. 63, figs. 1, 2, 3; Am//, J7w/-/. i, 1878, 



p. 23; [Godwin-Austen, MoL 2nd. ii, 1907, p. 166, pi. 106, figs. 1-1 d 

 (shell, genitalia, and radula)]. 



Shell perforate, depressed, thin, polished, microscopically decus- 

 sated, almost papillosely, with striae of growth and faint, close, 

 waved, longitudinal, impressed lines, yellowish horny ; spire low, 

 the sides slightly concave, suture impressed ; whorls 5, convex, 

 rapidly increasing, the last broader, rounded at the periphery and 

 beneath ; aperture slightly oblique, broadly lunate, much broader 

 than high ; peristome thin, columellar margin curved, scarcely 

 vertical above and briefly reflected. 



Major diam. 18, min. 15, height 4 mm. 



Hal). Darjiling, 4000-7000'. 



The animal has very broad shell-lobes to the mantle, almost 

 covering the spire when extended, and the dorsal lobes also are 

 very large ; the surface of the mantle is coarsely granular. 



[The material used in the following description was derived 

 from several sources : the most reliable as regards this species 

 from Dr. W. T. Blanford, collected by him at Darjiling and 

 preserved in spirit : also the shells in his collection. When in 

 Calcutta in 1877, Mr. Gr. Nevill placed in my hands a shell 

 identified by him as M. sequax, w 7 hich he had just received alive 

 from Darjiling, sent by Colonel Mainwaring. I made a careful 

 description of the animal at the time in my note-book, which I 

 give below ; but unfortunately, to make it complete, I did not 

 retain the shell. At the same time I made a drawing, showing 

 the form and position of the right shell-lobe and of the extremity 

 of the foot. In NevnTs ' Hand-list,' p. 23, there is a note 

 on the animal by Blanford : " A true Macrochlamys ; animal 

 pale, with back and tentacles black. W. T. B." Next I had 

 from Damsang, east of the Teesta River, some shells very similar 

 in general appearance, but smaller than the type shell, which 

 I at first took to be sequax; but on closer examination these 

 differ in several particulars sufficiently to constitute a new 

 species. 



Description of the living animal received from Darjiling : 



Living animal of sequax ? pale ochraceous throughout, including 

 the mantle ; a greenish tint on the neck, pinkish towards extremity 

 of foot. Tentacles dark, from the base of which run two parallel 

 dark lines towards the aperture. Erom the base of the lower 

 tentacle a groove runs diagonally up towards the posterior of the 

 neck. Mantle is slightly reflected over the peristome all round 

 and to a greater extent on the lower margin, where on the left 

 side, at about 0*35 inch or 9 mm. from the umbilicus, a small 



