240 LAND AND FRESHWATER 
up, it will be impossible to distinguish his species where several 
exist ; and as this group is certainly a remove from the typical 
Girasia in at least three points of structure (shell-lobes, shell, and 
radula), Inycus might be retained for it, and quite as well, if not 
better, than placing it in a section distinguished by a letter of the 
alphabet. 
GirastA (IBYCUS) SIKKIMENSIS, Var. MAINWARINGI, n. sp. (Plate 
LIX. figs. 3, 3a, 36, animal.) 
Hab. Darjiling. 
This animal, when living, must have been very dark-coloured ; 
the mantle-lobes finely papillate throughout ; the right shell-lobe is 
somewhat narrow, and is united to the left, which shows a small 
tongue-shaped expansion on the left frontal margin; the dorsal lobe 
is very largely expanded. The foot is very short behind and cut 
off square. The shell is, like that of stkimensis, broad in front. 
I have only a single specimen, which was obtained by Col. Main- 
waring; itis small, the papillation of the mantle is coarser than in 
sikkimensis and its colour distinct ; yet it is of similar form, and I 
can only consider it a dark variety. 
The jaw has a central projection. 
Girasta (IBycus) cacHaRIca, n. sp. (Plate LIX. figs. 4, animal, 
4a, 46, shell; Plate LXII. figs. 5, 5 a, 5b, and 5c.) 
Helicarion solidum, Godwin-Austen, Journ. A. 8. B. 1875, p. 6, 
pl. ii. figs. 5, 5a, 56, 5, 5d. 
Helicarion (Austenia) solidus, Nevill, Hand-list, p.16. One from 
Naga Hills, collected by Major Godwin- Austen. 
Locality. North Cachar Hills. 
Shell flat, horny, smooth, shining, with concentric lines of growth ; 
colour pale olivaceous brown (in type) or green, mature specimens 
more shelly and milky white within; apex very small and rather 
closely wound ; of one single whorl; aperture ovate. 
Size: maj. diam. 10:0, min. 6-0 mm. 
Animal, Is much speckled throughout, and with black bars on 
the side of the foot. The dorsal lobe very ample, extending round 
to the left posterior side; the right dorsal lobe rather small. The 
right shell-lobe is expanded over the apex, but is hardly connected 
behind; the left shell-lobe is narrow, and laps over the peristome, 
but does not join the other lobe. The posterior margin and apex 
of the shell rests in a V-shaped depression of the ridge of the foot 
as in Girasia hookeri, and the hinder part of the foot thence to the 
mucous gland is very short. 
Generative Organs (Plate LXII. fig. 5c). The amatorial organ is 
present, and the point of the dart is bent nearly at right angles to 
the main portion (vide fig. 5 6, Plate LXII.). 
Odontophore (Plate LXII. fig. 5). The large number of broad 
central teeth is peculiar; they have a well-formed cusp on the outer 
basal side. All the laterals are very pointed and curved, with the 
