Mr. Bell on a new Genus of Freshwater Tortoises. 511 



viduals, as indicating an intermediate sex, I have to observe, as 

 corroborative of the idea, that Mr. Haworth, in his remarks upon 

 a Paper on Bledius tricoriiis by Mr. Burrell in the Entomo- 

 logical Transactions, mentions a variety of the male with short 

 horns. Mr. Curtis also mentions a similar variety in BL 

 Siephensii. Mr. Burrell, indeed, in the paper above alluded to, 

 suggests that the specimens of the short-horned variety discovered 

 \iy himself may be neuters, and Mr. Haworth also expresses an 

 opinion coinciding with that of Mr. Burrell, and even conceives 

 that such neuters are much more frequent than hitherto imagined. 

 The use of the horns themselves is also noticed by Mr. Haworth in 

 the same paper. 



The sense of the first paragraph of p. 67, is confused by the 

 word " perfect" having been inserted in the 3d line, instead of 

 *' short horned." 



Art. LVI. On Hi/draspis., a new Genus of Freshwater 

 Tortoises^ of the family Emydidod. By Thomas Bell, 

 Esci., F.R.S., L.S., G,S., Sfc. 



On the most casual review of the fresh-water Tortoises, consti- 

 tuting the family Emydid^, it is impossible not to perceive that 

 they consist of several groups of importance, differing in many 

 essential points, both with regard to structure and habits. 

 Their subdivision consequently into the genera Terrapene of 

 Merrem, Kinosternon of Spix, Emys of Brongniart, Chelonura 

 of Fleming, Chelys of Dumeril, with the addition of Stei'no- 

 thccrus, defined in a former paper of mine in this Journal, is 

 perfectly consistent with nature, and has been sanctioned by the 

 adoption of Zoologists. A further investigation of the species 

 constituting the genus Ernies as it now stands, has shewn me 

 another group, which possesses so many important characters, 

 distinguishing it from all others, as in my opinion to require a 

 separate generic name. I had long ago believed that Tcstudo 



