76 LAND AND FRESHWATER 
very oblique costulation, on base smooth, but under lens beauti- 
fully concentrically and regularly striate, the oblique costulation 
does not extend to the suture, and each long rib has, above, a 
short parallel rib adjacent to it (vide fig. 4c); colour pale sienna- 
brown; spire low, apex blunt; suture impressed: whorls 4, regu- 
larly increasing ; aperture oblique, ovately lunate; peristome thin, 
columellar margin oblique. 
Size: major diam. 0°10—0°12 inch, alt. axis 0°05 inch. 
3 2°5-3°0 mm., $6 1:3-1°6 mm. 
Genus Macrocutamys, Benson. 
This generic title first occurs, but without description, in the 
J. A.S. B. vol. i. p. 13, January 1832, in a paper by Benson, who 
writes :—‘‘ Those (Pterocyclus, sp.) which I found were, with several 
specimens of a Cyclostoma, a reversed Carocolla and Macrochlamys ;” 
and in a footnote, “anew genus of the Helicidie, separated by me 
from Helix in consequence of the wide departure of the animal from 
the type of that genus ;”’ and the species is indicated, but not then 
described, from the Gangetic delta, on page 76 of the same volume, 
for in February 1832 Mr. W. H. Benson presented to the Society a 
series of the land and freshwater shells of the Doab and of the Gan- 
getic provinces, with a list, in which occurs “Helia (Macrochlamys) 
indicus, Benson, separated from Helix on account of the difference 
of character in the animal.” 
The genus is again referred to in vol. v. of same Journal, pp. 350, 351 
(1836). After describing Nanina decussata, Benson says, ‘¢ On a cur- 
sory inspection of this shell I erroneously considered it to be a variety 
of the species vitrinoides, Deshayes, belonging to Mr. Gray’s genus 
Nanina (Zool. Proc. July 8, 1834), which I indicated under the name 
of Macrochlamys in the first number of the ‘ Journal of the Asiatic 
Society ’ for January 1832, pp. 13 and 76, and which I altered to 
that of Tanychlamys in a paper on the genus read before the Zoolo- 
gical Society in August 1834. Mr. Gray’s characters, drawn up 
from specimens preserved in spirits and from General Hardwicke’s 
drawings, having the advantage of priority of publication, his name, 
although inexpressive, will necessarily be adopted. Several inde- 
pendent observers haye united in stating the necessity of separating 
this genus from //elzwv on the characters of the animal ; witness the 
observations of Lieut. Hutton (J. A. S. B. vol. iii. p. 83).” 
Again, in 1834, Mr. Benson exhibited a collection of shells from 
the Gangetic provinces of India, and gave a full description of this 
genus under the title Zanychlamys (altered by the editor to Nanina), 
at the August meeting of the Zoological Society, and recorded in 
the ‘ Proceedings,’ p. 89, as follows :— 
* A collection of Land and Freshwater Shells formed in the Gan- 
getic Provinces of India by W. H. Benson, Esq., of the Bengal Civil 
Service, and presented by that gentleman to the Society, was exhi- 
