159 



Measurements derived mainly from the more complete specimen are as 

 follows. 



Breadth. 



First vertebral plate - . . 

 Second vertebral plate. 

 Third vertebral plate . . 

 Fourth vertebral plate. 

 Fifth vertebral plate . . .. 

 Sixth vertebral plate . 

 Seventh vertebral plate 

 Eighth vertebral plate . 

 Ninth vertebral plate . 

 Tenth vertebral plate . . 



Length. 



Width 

 internally. 



Linen. 



Lines. 



45 



26 



GO 



24 



70 



24 



73 



22 



G9 



20 



GO 



17 



47 



15 





• 



Width 

 externally. 



First costal plate . . . 

 Second costal plate . 

 Third costal plate . . . 

 Fourth costal plate. . 

 Fifth costal plate . . . 

 Sixth costal plate . . . 

 Seventh costal plate . 



f.ilKS. 



37 

 2G 

 27 

 24 

 30 

 22 

 20 



The nuchal plate fore and aft has been about 2:| inches ; its breadth about 

 an inch greater. 



The marginal bones, so far as preserved, appear to have nearly the propor- 

 tions and aspects as in Dermatemys. Their vertical measurement is about 

 2 inches, and their width about the same. 



The measurements of the scute impressions are as follows: 



LeuKth. 



Breadth. 



First vertebral scute impression . . 

 Second vertebral scute impression 

 Third vertebral scute impression . . 

 Fourth vertebral scute inrpres'sion 



First costal scute at middle 



Second costal scute at middle 

 Third costal scute at middle 



Lines. 



Lines 



39 



52 



50 



30 



43 



33 



3S 



32 



54 



5G 



74 



4G 



70 



46 



