103 



EMYS PSEUDO-GEOGRAPHICA.— Leswewr. 



Piatt XV. 



Characters. Head small, oval; upper jaw emarginate; lower jaw hooked; 

 shell elongated, oval, emarginate anteriorly, serrate posteriorly, with a tubercu- 

 lated carina above, and a few horizontal striae on the lateral plates. 



Stnontmes. Testudo geographica, variety, a, Leconte, Ann. Lye. Nat. Hist. N. Y., vol. 

 iii. p. 110. 

 Emys pseudo-geographica, Lesiieur, manuscript, Dumeril et Bibron, Hist. Nat. des Rept, 

 torn. ii. p. 256, {Synonymes.) 



Description. The shell is elongated, oval, emarginate before and serrate 

 behind, with a remarkable tuberculated crest at the vertebral region. The first 

 vertebral plate is hexagonal, with its posterior border convex or arched, to be 

 received in a concavity of the second, and with a small point in front that enters 

 the nuchal; the second and third vertebral are hexagonal; the anterior border of 

 the second concave; the fourth vertebral is also hexagonal, but irregularly so, being 

 very narrow behind; the fifth is pentagonal, with an acute angle directed back- 

 wards, and received between the two posterior marginal plates; the four anterior 

 of these plates have each an elevated knob or tubercle; the fifth has only a ridge; 

 all these give a remarkable tuberculated vertebral carina; of the lateral plates the 

 anterior is irregularly triangular, with a rounded basis directed downwards and 

 forwards, and joined to five marginal; the second and third lateral plates are 

 pentagonal; the fourth is irregularly quadrilateral, broader below and joined to 

 three marginal. The anterior lateral plate is irregularly triangular, with its basis 

 rounded and directed downwards and forwards, and joined to five marginal; the 



