70 TESTUDINID®. 
long axillary and inguinal buttresses, the latter anchylosed to the 
fifth costal plates; entoplastron anterior to the humero-pectoral 
suture. Skull with a bony temporal arch ; alveolar surfaces broad, 
of upper jaw with a median ridge; choane between the eyes. 
Upper surface of head covered with undivided skin. Digits entirely 
webbed. ‘ail short or moderate. 
North and Central America; Southern Brazil, Uruguay, Buenos 
Ayres. 
agp 
oF EO 
Shell of Chrysemys scripta. 
Synopsis of the Species. 
I, Alveolar surface of upper jaw narrower at the symphysis than 
on the sides, the median ridge not or but finely denticulated ; 
outer surface of mandible arched. 
A. Plastron as large as the opening of the shell, the width of the 
