(0 



TESTITDINIDiE. 



lonp: axillary and inguinal bnttrcssos, the latter anchylosed to the 

 lit'tli costal ])latcs ; entoplastron anterior to the humero-pectoral 

 But lire. Skull with a bony temporal arch ; alveolar surfaces broad, 

 of upper jaw with a median ridge ; choana? between the eyes. 

 Up])('r surface of head covered with undivided skin. Digits entirely 

 ■webbed. Tail short or moderate. 



North and Central America ; Southern Brazil, Uruguay, Buenos 



AjTCS. 



Fio- 22 



Shell of Clirysemys scripta. 



Si/nojms of the SjHcies. 



I. Alveolar surface of upper jaw narrower at the symphysis than 

 on the sides, the median ridge not or but finely denticulated ; 

 outer Burface of mandible arched. 



A. Plastron as largo as the opening of the shell, the width of the 



