CHELOXIA. 



For the illustration of the osteological characters employed in 

 the systematic arrangement, the following figures are appended of 

 a skull, and of a shell stripped of the horny epidermal shields. 



A. 



Fig. 2. Skull of Trionyx yangeticus. 



A. Side view. B. Upper view. C. Lower view. 



ar. Articular. j. Jugal. pt. Pterygoid. 



bo. Basiocoipital. m. Maxillary. ptf. Postfrontal. 



bp. Basiphenoid. opo. Opisthotic. q. Quadrate. 



c.a. Columella auris. p. Parietal. qj. Quadratojugal. 



cor. Coronoid. pi. Palatine. s.ang. Supra-angular. 



d. Dentary. pm. Prfemaxillary. so. Supraoccipital. 



eo. Exoccipital. prf. Praefrontal. sq. Squamosal. 



/. Frontal. pro. Prootic. v. Vouier. 



