86 ZO?JITID.^. 



b'. Depressed. 

 a'. Sjxiralh/ (Jongitudinalhj) sndptured. 



120. Macro chlamys sequax, Bs. (Helix) A. M. i\. H. (y) iii, 1859, 

 p. 1'70; Pfr. (IlelLx) Mon. Hel. v, 1868, p. 118; H. 8f T. 

 (Helix) C. 1. 1876, pi. 63, figs. 1, 2, 3; Xei-ill, Haml-l i. 1878, 

 p. 23; [Godwin-Austen, Mol. hid. ii, 1907, p. 166, pi. 106, ligs. 1-1 r/ 

 (shell, genitalia, and radiila)]. 



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

 sated, almost papillose]}', with strioe of growth and faint, close, 

 waved, longitudinal, impressed lines, yellowisli horny ; spire low^, 

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

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

 beneath ; aperture slightly obhque, broadly lunate, much broader 

 than liigh ; peristome thin, columellar margin curved, scarcely 

 vertical above and briefly reflected. 



Major diam. IS, min. 15, heicrht 4 mm. 



Hah. Darjihng, 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. G. Nevill placed in my hands a shell 

 identitied by him as J/, sequax, which 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, shoA^ing 

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

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

 on the animal by Blanford : " A true 3IacrocJdam)/s ; 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, Avhich 

 I at first took to be sequa.v ; 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 w hich run two parallel 

 dark lines towards the aperture. From 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 



