166 LAND AND FRESHWATER 
Subfamily DrpLomMatiIninz&. 
Genus DipromMATINA. 
Diplommatina, Benson, A. M. N. H. 1849, vol. iv. p. 1938. 
Carychium, Hutton, Journ. A. 8. B. vol. iii. p. 85. 
Bulimus, Pfr. Mon. Hel. vol. i1. p. 81 (1848). 
Animal: Benson, A. M. N. H. April and June 1853; Blanford, 
A. M. N. H. 1867, vol. xix. p. 305. (Plate L. figs. 1 & 2, from 
nature.) 
The first specimens of this genus were found in the N.W. 
Himalaya by that indefatigable collector Captain Thomas Hutton, a 
naturalist who, landing in India as a cadet with a limited knowledge 
of natural history, but with an intense love of it, worked in the 
early days of his service in that country under great difficulties, when 
nooks were not so easily obtained and when it was even rarer than 
now to meet any one with kindred tastes to stimulate the collector 
or add to his knowledge of the subject. 
The Ann. & Mag. Nat. Hist. contains some interesting papers 
relative to the generic position this shell should hold, and even 
whether it possessed an operculum. This Mr. Gray was the first to 
discover ; subsequently it was also detected and acknowledged by 
Captain Hutton. Benson (/.¢., June 1853, p. 483) was particularly 
positive as to its being an unoperculated form; and an amusing note by 
Hutton, appended to his copy of this paper which he gave me, shows 
that he (Benson) was very unwilling to acknowledge Hutton’s con- 
firmation of Gray’s discovery. 
Hutton placed his newly found species, from the supposed absence 
of the operculum and the position of the eyes, in Carychium, while 
Pfeiffer placed it in Bulimus, as from Bengal, possibly in error of the 
exact locality. Benson, however, in September 1849, quoting this 
erroneous generic identifieation and having examined the animals 
of two species, founded a new genus, which he described as fol- 
lows :— 
“Tentacula two only, originating from the upper part of the 
head, long and filiform ; eyes situated on the posterior part of the 
tentacula at their base, composed of two lobes: one lobe deeply 
seated in the tentaculum and larger than the other lobe, which is a 
small black point coming to the surface on the outer side of the 
larger lobe; foot short. 
“Had the animal been provided with an operculum, it might 
possibly have been referred to the family of Cyclostomatids in 
accordance with the position of the eyes, and the form of the aperture 
of the shell. ‘The differences observable in the latter, as well as in 
its inhabitant, give countenance to a separation from Carychium ; 
I therefore propose for the type the following name derived from 
the peculiarity of the percipient (sic) points or eyes. 
