446 Mr. W. T. Blanford on the Classification of 



5. Cyclotus, 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 Oiopoma; and the question arises whether the 

 whole of the forms arranged by Dr. PfeifFcr 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 congeneric 

 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 in the 

 animal. 



II. C. filocinctus and its allies. 



III. The typical forms. The types of the genus Cyclotus, as 

 estabhshed by Swainson, are stated by Pfeiff"er (Mon. Pneum* 



