AMERICAN LAB YRINTHODONTIDM 



607 



Fig. 14 



Fig. 15 



Fig. 16 



Fig. i8 



Fig. 



19 



Fig. 17 



Fig. 14. — Eryops Cope; thoracic vertebrae; one-half natural size. 



Fig. 15. — Archegosanrus Goldfuss; thoracic vertebra (after Jaekel). 



Fig. 16.— Eryops Cope; anterior caudal vertebra; two-thirds natural size (after 

 Cope). 



Fig. 17. — Archegosaurus Goldfuss; caudal vertebra (after Jaekel). 



Figs. 18, 19. — Eryops Cope. Fig. 18, axis with top of arch missing; Fig. 19, 

 atlas; one-half natural size. 



i, intercentrum; n, neural arch. 



