MOLLUSCA OF INDIA. 239 
oldest portion including the nucleus was not preserved.) The 
lung-opening seems to lie far to the front; the cross rows of the 
radula form an angle in the middle, and run like the sides of an 
isosceles triangle to the back, so that a separate row with its accom- 
panying somewhat prominent middle tooth looks like a flock of 
herons ; tooth-plates small, and do not touch each other, except in 
the middle. From them the shovel-like (7. e. the pointed kind) 
tooth rises high up and over the plates; middle tooth-plate 
above and below much widened, the shovel rises up like a spoon 
and is connected with the plate by a kind of bridge. The first side 
teeth are similarly shaped, and have on the side near the edge, far 
below, an attachment, which through the bridge is also connected 
with the plate, but soon this attachment rises higher and becomes 
an equally good point. This form continues towards the end, 
where I observed in the not fully developed teeth a third point 
rather far down ; this rises on the following teeth higher and higher 
up, culminating finally in the next adjacent tooth. I know of no 
similar tooth-formation among the slugs or other snails, and while 
Anidenus represents our Arion in the Himalaya, this species is 
probably there a type peculiar to the country.” 
Grrasta (Ipycus) sIKKIMENSIS, n. sp. (Plate LIX. figs. 2, 2a, 
animal ; 2 4, shell.) 
? [bicus fissidens, Heynemann. 
The animal, from the spirit-specimen, appears to be of a pinkish 
grey when living. The mantle finely papillate, and finely sprinkled 
with small black spots, a few similar distant markings on the side 
of the foot benind. 
Hab. About a mile south of Chungthang, on the Chakang 
stream, about 9500 feet. Independent Sikkim, December 1883 
(W. Robert). 
The Generative Organs. The male organ has an elongate kale- 
sac; the amatorial organ is stout, short, and blunt. 
Odontophore. The centre tooth of the radula is strongly tricuspid ; 
the median are as usual, the laterals, as in A. giyas, bicuspid; the 
inner point much longer than the outer; in other words, the outer 
cusp is situated some distance below the apex of the tooth. The 
extreme outside laterals become very small. 
Jaw with a prominent central projection. 
I have very little doubt that this and similar forms from Darjiling 
represent the genus /bycus described by Heynemann froma specimen 
collected by one of the brothers Schlagintweit in the same neigh- 
bourhood. Heynemann unfortunately had only an imperfect specimen 
to describe, which wanted the entire hinder part and portion of the 
mantle, and even the shell had lost the apex. Nevertheless, from 
certain characters, such as the papillate surface of the front part of 
the mantle, the type of shell (shovel-shaped), and the jaw with 
prominent centre, and the description of the radula, his species 
would come in here. Although the generic position can be cleared - 
PART VI. Y 
