1876.] collected during tlw Dafla Expedition. 177 



tion the ribbing is very fine and close. Spire conoid, apex blunt, suture 

 impressed, the sutural tube moderate. Whorls 4, the last swollen, then 

 constricted, and enlarging again into a well-raised ridge, which terminates 

 below on margin of the peristome, it then descends and expands considera- 

 bly with four deep longitudinal plications. Peristome single (no sign of 

 the usual outer margin), continuous, with five plications on tbe outer mar- 

 gin, the lower margin recurved. Aperture oblique. Operculum multispiral, 

 horny, with a large disc-like boss in the centre front side. 



Hab.— Tomputu Peak, 7000 feet. 



The nearest form to the above is A. digitatus, H. Blf., described 

 and figured in J. A. S. B., Vol. XL, 1871, from Darjeeling, but the 

 duplicate peristome in that shell is conspicuous and forms a well-defined 

 sharp edge where the expansion and plication of the inner lip commences. 

 By the operculum alone it can be at once distinguished, and it is besides 

 a much smaller shell. 



A dwarf variety occurs on Shengorh peak only - 09 in alt., not so ex- 

 panded near the aperture, and with the plication less developed. On the 

 Tanir ridge at 4000 feet, the same shell, of ordinary size and with the same 

 character of the aperture, occurs, shewing an interesting and gradual change 

 in form ; the operculum is also different, being pale coloured, multispiral, 

 and flatly concave in front. This form is in this respect much nearer to 

 A. digitatus and might be separated under the title sub- digitatus. 



Alyc^tjs mutattts, n. sp., PI. VII, Pigs. 11 & 11a. 



Shell sub-turbmately depressed, openly umbilicated, fragile, covered 

 with a scabrous dull ochreous epidermis, which peels off in old shells, very 

 regularly and strongly striated throughout, the ribbing on the last whorl 

 very fine. Spire sub-conoid, apex rather blunt, suture cleej)ly impressed. 

 "Whorls 4, rounded, the last swollen, moderately constricted, then again 

 expanded and crossed by two ridges, the last of these not extending all 

 round the whorl. The constriction very regularly ribbed. Sutural tube 

 short, thickened at the base. Aperture oblique, circular. Peristome double 

 but closely united, very slightly reflected. Operculum multispiral, the 

 edges of the outer whorls in high relief so as to form a deep cup-like 

 hollow in the centre. 



Alt. - 10, major diam. - 20, sutural tube - 055 in. 



Hab. — On Toruputu, Tanir, and Shengorh Peaks, at 6 — 7000 feet 

 elevation, in the dead leaves and moss about the roots of the forest trees, 

 I found about a dozen. The ground at the time was covered with snow, 

 so that it was very cold work hunting for them. 



This shell is an interesting ally of A. KMsiacus, from which it differs 

 in its thick well-ribbed epidermis, but more especially in the very different 



