BENSONIA. 175 



273. Bensonia wynnii, inf. (Macrochlamys) J. A. S. B. 1880, 2, p. 197, 



pi. 3, fig. 5 ; Oodwin-Austen, Mol. Ind. ii, 1899, p. 118, pi. 95, 

 figs. 2-2 h, 8, 8a; Kobelt, Nanina (Xestina), Mart. ^ Chemn. 

 Syst. Conch.- Cab., Naninidae, 1901, p. 996, pi. 258, figs. 4, 6. 



Very similar to B. jacquemonli, but distinguished by having the 

 mouth much more oblique, diagonal in fact, and consequently 

 larger, with the basal margin of the peristome straight, not 

 arcuate, and with no ti'ace of internal thickening. 



Major diam. 19, min. 17|, height 9;^ ram. 



The aperture measures 10 1 by 9~ mm. ; in a specimen of 

 B.jacquemontii of about the same size 10 by 7. 



Hab. Mui-ree ( Wynne) ; Cherat, near Peshawar ; Kuram Valley ; 

 Kandahar. 



II. Shell keeled at periphery. 



274. Bensonia camura, Bs. A. M. N. H. (3) iii, 1859, p. 269 (Helix) • 



Pfr. Man. Hoi v, 1868, p. 180 : H. ^- T. C. I. 1876, pi. 55, fig. 2 ; 

 Nevill, Hand-l. i, 1878, p. 30 (Nanina) ; ? Godwin-Austen, J. A. 

 S. B. 1882, 2, p. 71, pi. 5, fig. 5, animal (Euplecta.?^) ; id. Mol. 

 Ind. ii, 1907, p. 147, pi. 101, figs. 1-7 (animal & anatomy). 



Shell narrowly umbilicated, couoidly depressed, sublenticular, 

 carinate, translucent, horny, obliquely rugosely plicate, and beneath 

 the microscope minutely obliquely rugate, the rugae intersecting 

 the coarse striae at an acute angle, lower surface smoother, but 

 still minutely obliquely decussated with raised lines ; spire de- 

 pressedly conoid, sides flattened, suture very little impressed ; 

 whorls 6^, scarcely convex above, the last with a compressed keel, 

 rounded beneath ; aperture oblique, angulately lunate ; peristome 

 thin, with a slight white thickened callus inside not always present, 

 the basal margin arcuate. 



Major diam. 20, min. 18|, height 10 mm. 



Hab. Sikhim, 7000-12,000 feet. 



Some specimens are larger. The compressed keel in the young 

 is file-like. The shell resembles that of Macrochlamys tugurium. 

 but is far more sharply keeled and different in sculpture. The 

 animal is grey ; sole broadly margined, and has, if the published 

 figure be correct, a very small lobe above the mucous pore : this 

 lobe I failed to detect. 



[Mr. W. Kobert's collection, from llissom Peak, Cheungtano-, at 

 the junction of the Lachen and Lachung Rivers, and Zemo 

 Samdong, in mid-Sikhim, has cleared up much that was doubtful 

 regarding both the generic position and range of tliis species. The 

 animal (in spirit) is ochraceous ; on removing the shell there is a 

 remarkable resemblance in the markings of the integumelat or roof 

 of the pulmonary cavity and renal organ to that of Macrochlami/s 

 tugurium, a broad patch near to rectum, and a longitudinal streak 

 in the middle line, gradually widening and increasing in intensity 

 backwards up to the renal organ ; above this it is half black, half 

 white; the rest of the surface is spotted and streaked with 

 greenish black. This greenish tint pervades the whole of the 



