342 Mr. W. T. Blanford on some Indian 



globosa, Bens., does not differ in any important character from 

 that of R. 7'ubens ; bnt I have not isolated the separate teeth 

 so as to count the denticulations. 



The nearest approach to the lingual dentition of Bealia 

 appears to be made by Chondropoma candianum, D'Orb. (conf. 

 Troschel, Gebiss der Schnecken, vol. i. pi. 5. fig. 1), which 

 Troschel regards as forming a link between West-Indian 

 Cyclostomida? (Licininge) and the European and African forms 

 (Cyclostomime). The characters of the central teeth and two 

 inner lateral approach more nearly to those of the latter sub- 

 family, while the outer laterals show the peculiarity which 

 has induced some naturalists to consider the former a link 

 between the Tamioglossa and Rhipidoglossa. 



The examination of the teeth, on the whole, tends to con- 

 firm the position assigned to Bealia by Pfeiffer as a subfamily 

 of Cyclostomidas equivalent to the Licininse and Cyclostominte. 

 Of course, Hydrocena and the Assiminece, hitherto included, 

 must be removed to other families. 



2. On Cyclotopsis. 



When first describing this genus, in 1864 (Ann. & Mag. 

 Nat. Hist. ser. 3. vol. xiii. p. 447), I pointed out that Cyclotus 

 conoidetiSy Pfr., from the Seychelles and Mauritius, would pro- 

 bably prove to belong to it. Mr. Geoffroy Nevill has recently 

 collected specimens which completely confirm this opinion : 

 both shell and operculum agree perfectly in character with the 

 typical Indian species. 



In the l Zoological Record' for 1864, Dr. von Martens ex- 

 presses his dissent from my conclusion that this genus belongs 

 to the Cyclostomidse proper, because its operculum has several 

 whorls. Dr. von Martens must have overlooked my descrip- 

 tion of the animal (p. 446), in which I pointed out that it 

 possessed the longitudinally cleft foot and peculiar mode of 

 reptation so characteristic of the Cyclostomidas — a character 

 of much higher importance than the number of whorls in the 

 operculum. Several West-Indian Cyclostomidee belonging to 

 the genus Choanopoma have polyspiral opercula, some of them 

 with four and five whorls — quite as many as are found in 

 Cyclotopsis. I pointed out the resemblance of the operculum 

 in the Indian forms to that of Choanopoma, when first de- 

 scribing the genus (I. e. p. 448). 



Dr. Stoliczka has lately carefully examined the anatomy of 

 Cyclotoptsis, and entirely confirms my view of its affinities. 

 The lingual teeth are very similar to those of typical Cyclo- 

 etomata, and do not resemble those of Cychphorus. 



