59 



EMYS PSEUDO-GEOGRAPHICA.— LesMewr. 



Plate IX. 



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. 



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

 iii. p. 110. 

 Emys pseudo-geographica, Lesueur, manuscript, Dum. et Bib. Hist. Nat. des Rept, torn, 

 ii. p. 256, (Synony7nes.) 



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 vertebrals are hexagonal; the anterior 

 border of the second concave; the fourth vertebral is also hexagonal, but irregu- 

 larly, being very narrow behind; the fifth is pentagonal, with an acute angle 

 directed backwards, 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 marginals; the second and third lateral 

 plates are pentagonal; the fourth is irregularly quadrilateral, broader below and 

 joined to three marginals. The anterior lateral plate is irregularly triangular, 

 with its basis rounded and directed downwards and forwards, and joined to five ' 



