Measurements. M. 



Length of carapace to the posterior border of seventh 



costal .250 



Depth at third vertebral bone 150 



Length of second vertebral bone - 031 



Width " " " " 032 



Thickness " " " 013 



Length of first marginal " 035 



Width " " " 033 



Length of first do. of the bridge 028 



Width " " " " 060 



Width of second costal. 033 



Thickness of " " 012 



Greatest width of carapace 182 



Length of plastron (axial) 211 



" " anterior lobe (axial) 073 



" " posterior lobe " 070 



Width of base of anterior lobe 115 



" " "posterior" 086 



Length of bridge , . 090 



" " mesosternum 042 



Width " " 046 



Length of clavicle 051 



" " common suture of clavicles 014 



" " " " " hyosternals 051 



" " " " " hyposternals 047 



Width of postabdominals at anterior border 057 



The shell of this species is thicker than in any species of tortoise now 

 living in North America, a peculiarity characteristic of most of the species 

 of the Cretaceous period, and of many of those of the Eocene. Its size is 

 about that of the Pseudemys serrata. 



