182 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



but in drier weather they are easily overlooked. At the same time, 

 until the animal has been compared, it is perhaps best to keep 

 Macrochlamys Dalingensis and 31. Mainwaringi distinct, since it is 

 still possible that the later, if without shell-lobes, may prove to be 

 a Bensonia. I regard it, however, as probably a Macrochlamys. 



80 far as I am aware, no description of the shell of 31. Mainwaringi 

 has yet appeared in print, so 1 append one with the synonymy. 



Macrochlamys Mainwaringi, Nevill. 



Helix celox, Bs. : Theobald, Journ. As. Soc. Bengal, pt. 11, vol. xxxii 



(1863), p. 365. nomen nudum. 

 Macrochlamys celox, Bs. : Theobald, Cat. Land & Fresh-water Shells 



Brit. Ind., 1876, p. 17, nomen nudum. 

 Nanina (Bensonia?), n.sp., jSevill: Hand List Moll. Ind. Mus. Calcutta, 



1878, p. 49, No. 272. 

 Bensonia : (?) Mainwaringi (G. Nevill MS.), Godwin- A u sten : Journ. 



As. Soc. Bengal, pt. 11, vol. li (1882, published 



March 1st. 1883), p. 69, pi. v, fig. 3. 



Testa perforata, subturbinato-depressa. pallide fulva, tenuis, cornea, 



translucens, supeme vix nitida, oleoso-micans, striata, lineis spiralibus 



minutis impressis sub lente decussata, subtns laevior et nitidior ; spira 



depresso-conica, apice obtuso, sutura leviter impressa ; anfr. 6-7, 



Macrochlamys Mainwaringi, Nevill. 



regulariter accrescentes, ultimus non descendens, ad peripheriam 

 rotundatus ; apertura parum obliqua, lata, lunaris ; peristoma rectum, 

 tenue, intus calloso-labiatum, albidum ; nonnullis fasciis transversis, 

 varices mentientibus, intus callosis, albidis, in anfractibus ultimis 

 ssepe conspicuis. Diam. maj. 27, min. 23-5, axis 15-5 mm. Apertura 

 alt. 13, lat. 14 mm. 



Hah.— Ad Darjiling (alt. circa 7,000 ped.) in montibus Himalayanis 

 Sikhimensibus. 



So far as the evidence extends (and I have seen several specimens 

 of both forms), M. Mainwaringi inhabits the ranges around Darjiling, 

 west of the deep sub-tropical gorge of the Teesta, which runs from 

 north to south, dividing the Darjiling hills from the Daling Duar 

 of Bhutan, in which is the locality that has yielded M. Dalingensis, 

 so the Teesta Valley may divide the areas inhabited by the two forms 

 from each other. 



