446 Mr. W. T. Blanford on the Classification of F 
5. Cycrorvus, Guilding. 
To this genus five Indian species have been referred, viz. :— 
C. semistriatus, Sow. 
C. subdiscoideus, Sow. 
C. spurcus, Grat. 
C. montanus, Pfr. 
C. filocinctus, Bens. 
The last I shall refer to presently as the type of the genus 
Cyathopoma. With C. spurcus and C. montanus I am unac- — 
quainted. I have a large number of specimens of C. subdiscoideus, — 
from Orissa, and C. semistriatus, from Poona, lying before me, — 
and I am unable to observe any constant character by which 
they can be distinguished,—the slight expansion of the peri- 
stome occurring in specimens of both, and the spiral sculpture 
and height of spire being to some extent variable characters. 
My specimens do not suffice to prove an absolute passage, al- 
though they indicate its probability. 
I have referred to the resemblance of the shells of these spe- 
cies to certain forms of Cyclostoma ; but the concentric character 
of the operculum would have induced me to class them with 
Cyclophorus ; and I was somewhat surprised, on examining the 
animal of C. semistriatus, to find that it possessed the long 
looping muzzle, longitudinally cleft foot, and peculiar mode of 
reptation of Cyclostoma (e. g. C. elegans). There can therefore 
be no longer any doubt that this species and its allies must be 
classed near Otopoma; and the question arises whether the 
whole of the forms arranged by Dr. Pfeiffer and others in the 
genus Cyclotus have similar affinities. I suspect not. The 
genus may be divided into several sections, which I will briefly — 
note. 
I. The American species, which have little in common with 
those of Asia and the Asiatic islands, but which, probably, like 
C. semistriatus, should be classed with Cyclostoma. They have 
been distinguished as Aperostoma and Cyrtotoma. I am not 
aware if the animals of these shells have been examined ; but it 
is not very probable that either they or the American forms 
ascribed to Cyclophorus and Megalomastoma are really congeneri¢— 
with the oriental species, They more probably represent them, 
just as the Sesara section of Nanina does. the Tridopsis division 
of Helix, the shells in this case being so similar that they would - 
certainly be classed together but for “essential distinctions 1 in the 
animal. 
Il. C. filocinctus and its allies. ; 
III. The typical forms. The types of the genus Cyclotus, as 
established by Swainson, are stated by Pfeiffer (Mon. Pneum. 
