122 LAND AND FRESHWATER 
as M. dalingensis, but no shell-lobes are visible, and the horn above 
the mucous pore is unusually well developed. Stoliczka wrote 
*lubrica?” below this; Nevill “ mainwaringi ?” and on the other 
drawing ‘‘mainwaringiana.” No. 21 is also the species referred to 
in Nevill’s Hand-list, p. 49, no. 272, Nanina (Bensonia?), n. sp., 
with this note :—‘‘ Perhaps better classed near NV. tugurium. From 
a drawing of Dr. Stoliczka’s the animal appears to be of a brick- 
red colour, with a pointedly truncate tail and remarkably developed 
nearly vertical horn above. 20 sp. Darjiling. Coll. Dr. F. Stoliczka 
and Colonel G. B. Mainwaring.” There is some uncertainty about 
Nevill’s MS. title mainwaringi, and I therefore do not retain it, 
but think it better, so as to avoid any future confusion, and as my 
specimens include the animal which I also describe, to give it the 
above name dalingensis. I have a fine specimen of Mr. Nevill’s 
mainwaring? received from him, and although no doubt belonging to 
this group, it differs very much in colour and form. I shall figure 
it with tugurium and other shells in some future part. 
The animal (figs. 3 and 4) is pale coloured in the spirit-specimens. 
The right shell-lobe is present though not very large, and there is a 
left shell-lobe (figs. 4 and 5) on the anterior left margin of the 
peristome, thus not quite so far back as in other forms. The left 
dorsal lobe is divided into two parts, and the posterior (fig. 4) is 
narrow and pointed behind, showing an interesting approach towards 
the more reduced form of the same lobe in Oxytes cycloplaw (Plate 
XXXI. fig. 4) and orobia (Plate XXXII. figs. 1, 1 a, 16); the an- 
terior portion is well developed. The extremity of the foot presents 
a different formation, and even in the spirit-specimen is still long ; 
the ridge of the foot behind extends quite to the point, running up 
between the extended pedal margin; the gland is linear and just 
reaches to the sole of the foot, which is of normal form. 
Generative organs (fig. 9). These do not call for any de- 
tailed description, being very similar to MW. indica; the kalk-sae is 
moderately long, the amatorial organ slender and pointed near the 
muscle-attachment ; the hermaphrodite duct much convoluted. 
Odontophore. The central and laterals (figs. 8, 8a) as in type 
of genus, but the laterals are more numerous and diminish in size 
into very small teeth on the outer edge (fig. 8 b). 
BO ates tte, Lk ce, 6) 20 
Giael en Ol 
The laterals are bicuspid at first, with the inner point the longest, 
but pass outwards into almost unilateral teeth, showing only a 
slight notch near the point. 
The salivary glands are in one mass; the cesophagus and intestine 
are of same size throughout (fig. 10). 
