4d: Mr. W.T. Blanford on the Classification of, 
D. Kingiana from the Kolamully Hills, are distinguished by 
their cylindrically-ovate form, smooth whorls, continuous cir- 
cular peristome not expanded into a callus upon the penultimate 
whorl, by the absence of a columellar tooth, and by the regular 
convexity of the sides of the spire. The earliest described spe- 
cies, D. folliculus, Bens., and its congeners in the Western Hi- 
malayas, D. costulata, Bens., and the sinistral D. Huttoni, Pfr., 
are to some extent intermediate between the two types; but 
they approach less nearly, in their costulated whorls, more acu- 
minate spire, and less circular mouth, to the Peninsuiar forms 
than to those of the Eastern Himalaya*. 
I have lately found, in the Western Ghats near Bombay, a 
very peculiar minute species, belonging to the Peninsular type, 
but distinguished from every other form in the genus by pos- 
sessing spiral sculpture, 
3. OpistHostoma, H. Blanf. 
Since the discovery of the minute O. Nilgiricum, described by 
my brother, Mr. H. F. Blanford, in the ‘Journal of the Asiatic 
Society of Bengal’ for 1860, no additional form of this most 
remarkable genus has been met with, nor do any more specimens 
appear to have been collected. 
In the ‘ Malakozoologische Blatter’ for the present year (p.39), 
Dr. Dohrn, reviewing our papers, considers this form as probably 
belonging to the Pupinide, and remarks especially on its resem- - 
blance to the Philippine Arinia. This tends to confirm our 
belief in its Cyclostomaceous affinities, of which, indeed, there 
can be little doubt; but the position of Arinia itself is far from 
being satisfactorily determined, and it is classed by many writers 
(e.g. Pfeiffer and Adams) with Diplommatina. It appears pro- 
bable that, in all the characters which tend to connect Opistho- 
stoma with Arinia, the former shell approaches equally to certain 
forms of Diplommatina, partly to the Indian forms, and also in 
some respects to the sinistral group of Australia. In its costu- 
lation and minute size, Opisthostoma certainly approaches Di- 
plommatina, and differs from the Pupinide, which are mostly 
characterized by the absence of sculpture. The last whorl in 
many species of Diplommatina rises so far in front of the shell 
as almost to touch the antepenultimate; so that it is easy to 
understand the connexion with the singular distortion of the 
last whorl of Opisthostoma, which, on the other hand, has no- 
thing approaching to the peculiar slits and tubes characterizing — 
the aperture of most of the Pupinide. 
* This is by no means the only instance in which the land-shells of the — 
Western Himalaya are more nearly allied to those of India proper than — 
are the species inhabiting the same mountains further east. 
