PLATE XXIII. 



Figs. 1,^. — CrocodUua acer. From near Manti, Utah. Page 154. 



Fig. 1. — Cranium, nearly one-balf natural size, from above ; o, left side ; b, posterior view. 



Fig. 2. — Fourth maxillary tooth of right side, natural size; a, section of crown, one-fourth way above 

 base. 



Figs. 3-8. — Emys ^haityhnmniaua. Type from Cottonwood Creek, near Fort Bridger, Wyoming, three- 

 eighths natural size. Page 135. 



Fig. 3. — Portion of carapace, fmm above. 



Fig. 4. — Last three vertebral bones, edge view. 



Fig. 5. — l-'irst costal of right side, below. 



Fig. 6. — Ninth marginal bone of right side, anterior edge 



Fig. 7. — Eighth marginal bone of left side, anterior edge. 



Fig. 8. — Eutosternal bone, from below. 



Figs. 9-11. — Emys tvyoviingensis. Three-eighths natural size. From near Fort Bridger, Wyoming. 

 Pago 135. 



Fig. 9. — Fifth vertebral bone, from above ; a, border, showing thickness. 



Fig. 10. — First costal bone of right side, from below. 



Fig. 11. — A posterior marginal view of edge. 



Figs. I'J, 13. — Emys tcstudinea. One-half natural size. From Bear River, Wyoming. Page 134. 



Fig. li. — Entosterual bone, from below. 



Fig. 13. — Left border of posterior lobe of plastron, from above. 



Figs. 14-lU. — Notomorj>ha ijravis. From Bear River, Wyoming. One-half natural size. Page 143, 



Fig. 14. — Supposed left anterior lobe of plastron. 



Fig. 15. — Right eighth marginal bone, posterior edge. 



Fig. IG. — Left seventh marginal bone, posterior edge. 



Figs. 17, 18. — Proiatjras lacuntris Cope. Vertebrie, one-half larger than nature. From Cottonwood 

 Creek, Wyoming. Pago 103. 



Fig. 17. — Lateral view; a, inferior; b, anterior; and c, posterior views. 



Fig. 18. — Anterior view of neural arch of another vertebra, displaying aygosiihene. 



