424 ]\Ir. G. A. Boiilenger 07i the Reptiles and 



EEPTILIA. 



C H E L N I A. 



Testudinidae. 

 Clemmys, Wagl. 



Clemmys Dorhignyi. 



Emys Dorhignyi, Dum. & Bibr. Erp. G^n. ii. p. 272 ; d'Orbigny, Voy. 

 Am. Mer. v., Kept. p. 6, pi. i. 



B. M. ; V. I. Near Rio Grande. 



i 



Chelydidse. 



a. Nuchal plate marginal ; a pair of barbels on the chin . . Platemys. ' 



b. Nuchal plate simulating a sixth vertebral ; no barbels.. Hydromedusa. 



Platemys, Wagl. 



A. Barbels nearly as long as the diameter of the eye, : 



black at the base ; upper surface of neck with 

 flat warts ; soft parts with dark spots or bands. 



a. A broad black band on each side of the head ; plas- 



tron dirty yellow or brown ; carapace with black , 



and yellow lines or vermiculatious P. Geoffroyana, 



b. A narrow black line on each side of the head ; plas- 



tron yellow with black spots; carapace uniform 

 olive-brown or with a few black spots P. Hilairii. 



B. Barbels very short, smaller than the wai'ts on the 



upper surface of the neck, which are large, coni- | 



cal, erect ; soft parts uniform olive-brown ; plas- J 



tron blackish P. Spixii. \ 



Platemys Geoffroyana. 



Emys Geoffreana, Schweigg. Arch. Kouigsb. i. 1812, p. 302. 



Platemys Geoffreana, Dum. & Bibr. I. c. p. 418. 



Plate7nys Geoffreyana, part., Hensel, Arch. f. Nat. 1868, p. 350. 



B. M. ; V. I. 



Platemys Hilairii. 



Platemys Geoffreana, ]vi\., Dum. & Bibr. /. c. p. 421. 



Platemys Hilarii, Dum. & Bibr. /. c. p. 428 ; Burmeister, Keise La 



Plata, ii. p. 521. 

 Platemys Geoffreyana, part., Hens. /. c. p. 350. 

 Spatulemys Lasalce, Gray, Ann. & INIag. Nat. Hist. (4) x. 1870, p. 463, 



and xi. 1871, p. 73, pi. ii. 



B. M. ; V. I. 



Platemys Sj)ixii. 

 Platemys Sjjivii, Dum. & Bibr. I. c. p. 409. 

 B. M. ; V. I. One example, from San Lorenzo. 



