342 Mr. W. T. Blanford on some Indian 



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

 that of B. ruhens ; but I have not isolated the separate teeth 

 so as to count the denticuhxtions. 



The nearest approach to the lingual dentition of Realia 

 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 

 Cyclostomidaj (Licinin^) and the European and African forms 

 (Cyclostominse) . 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 Tasnioglossa and Rhipidoglossa. 



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

 firm the position assigned to Realia by Pfeiffer as a subfamily 

 of Cyclostomidfe equivalent to the Licinina3 and Cyclostominae. 

 Of com*se, Hydrocena and the Assiminecey 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 Cydotus 

 conoideuSy 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 'Zoological Record' for 1864, Dr. von Martens ex- 

 ])resses his dissent from my conclusion that this genus belongs 

 to the Cyclostomida? 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 Avhorls in the 

 operculum. Several West-Indian Cyclostomidaj 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 Glioanopoma^ when first de- 

 scriljing tiie genus (J. c. p. 448). 



Dr. Stoliczka has lately carefully examined the anatomy of 

 ('yc'of(>j)sisj and entirely confirms my view of its affinities. 

 The liuiiual teeth are very similar to those of typical Cycle- 

 i<t(iiii<(fff, and do not reseiiil)h' those of Cyclophorus. 



