depressed line extends backwards to the humero-gular suture, cutting off 

 triangular gulars and extending the intergulars back to the numerals as in 

 Adocus. The other depression extends directly across the anterior lobe, 

 cutting off small intergulars as in Baena. In either case the arrangement 

 represents a genus distinct from either of those named. If the intergulars 

 extend to the humerals they are double, the mesosternal region being di- 

 vided by a distinct longitudinal dermal suture. If the intergulars are 

 short, with the gulars in contact behind them, the arrangement is equally 

 distinct from Adocus. From Baena the absence of intersternal bones, and 

 the Emydoid mesoslernum distinguish it. It approaches also Polythorax* 

 and may indeed belong to that genus. But it does not appear that the hu- 

 merals and interhumerals are distinct in tbe Georgia turtle, and no inter- 

 marginals are observed in Polytlwrax. It is therefore necessary to give the 

 present genus, a name to be used until its relations to the latter are posi- 

 tively ascertained. I propose Amphiemys for the genus, and A, oxystern- 

 um as the specific name. 



Specific characters. The plastron is nearly plane in the transverse direc- 

 tion ; longitudinally the posterior lobe is a little raised above the plane, 

 and the anterior lobe rather more so. 



The general form is elevated, the vertical diameter being large when 

 compared with the longitudinal and transvere, which preserve usual pro- 

 portions. The border of the carapace is not flared at the sides, and rises 

 anteriorly to the nuchal bone. The free anterior margin is somewhat un- 

 dulate. The anterior half of the carapace does not display any median or 

 lateral keels. 



The nuchal bone is considerably wider than long, and the costal and 

 marginal sutures are of about equal length. The vertebrals are all longer 

 than wide, and of the usual form, with truncate antero-lateral angles, ex- 

 cepting the first. This one has both the sides and extremities convex, the 

 latter being of subequal width. The costals are thick, and have parallel 

 borders. The marginals are all higher than long, especially those of the 

 bridge. 



The sutures of the plastron are fine and straight. The portion of the 

 mesosternum enclosed by the episternal or clavicular bones has greater 

 longitudinal'extent than the part embraced by the hyosternals. The su- 

 tures with the clavicular bone are nearly straight, and are parallel with the 

 free border. The common suture of the hyosternals is a little longer than 

 that of the hyposternals, and is a little shorter than that of the post- 

 abdominals. The anterior suture of the latter has a slight posterior ob- 

 liquity, and is abruptly turned backwards at the free borders of the lobe. 



The dermal sutures of the carapace are mostly obliterated. Enough re- 

 mains to show that the second vertebral was wider than long, while the 

 nuchal shield is considerably narrower than the nuchal bone. The mar- 

 ginal scuta are much narrower than the marginal bones, and become nar- 

 rower forwards. The region of the nuchal marginal is obscure. 



* Cope, Proceed. Acad. Philad'a, 1876, Nov. 



