TAB. XI. 



Skull of the Chelone crassicostata^ two thirds of the nat. size. 



Fig. 



1. Upper view, showing chiefly a cast of the under surface of the bones. 



12. The situation of the postf rentals. 14. The prefrontals. 1.5. The nasals. 



2. Side view. 



3. Under view of the symphysis menti. 



