PLATE LVIIIa. 



Fig. 1. — Dathyopsisjisddtns. lucisor tootli, found with inferior molars; natural size. Page o97. 



Fig. 2. — Triplopus amarorum. Cranium of specimen represeuteil in Figs. 6-9, PI. LVrt, two-tbiril.s nat- 

 ural size; from above; «, from below. From South Bitter Creek. Page (387. 



Fig. 3. — Maxilliiry teeth of right side of I'liUvomjops hortulis. From the Wind River, Wyoming; natural 

 size. Page 703. 



Fig. 4. — Eight maxillary and malar bone.s of Llmiiohiius fviilhinliv. .Specimen figured on PI. XLIX, 

 Fig. 4, natural size; seen from Ijelow. Page 707. 



Fig. 5. — Postzygomatic part of same eraiiiiim seen from below ; one-half natural size. 



Figs 6, 7. — Atlas and axis of the specimen of Ejirarhiiiis tximhis, whose mandibular ramus is repre- 

 sented in Fig. '2, PI. LII; 5a, from above; 'il>, from below ; (i, left side; (ia, fiom front. 



Figs. 8-16. — Vertebra^ of snakes from the White River beds of Northeasteru Colorado, excepting Figs. 

 10-13, which are from Oregon. 



Figs. 8, 9. — Xeurodromiciis dorisalh. Page 786. 



Fig. 8. — An anterior vertebra, natural size ; from behind. 



Fig. 9. — Same; same view | natural size, o, same from front ; i, side view of same ; c, inferior view 

 of same, same size, J nature. 



Figs. 10-13. — Ogmoplns oret/onensis. Typical specimens, from the John Day's River, Oregon. Page 783. 



Fig. 10. — An anterior centrum, natural size, from behind. 



Fig. 11. — Two consecutive vertebrae, twice natural size, left side ; a, superior view ; h, inferior view of 

 posterior centrum, natural size. 



Fig. 12. — Another vertebra, inferior view, natural size; a, the same from front. 



Fig. 13. — Ogmophis angulatus. Dorsal vertebra, twice natiira! size, leit side ; u, i>osterior view ; c, infe- 

 rior view. Page 783. 



Figs. 14-16. — Calamagras miirironis. Vertebra', twice natural size. Page 784. 



Fig. 14. — Posterior .series, .slightly larger than the iinteriur, Fig. 15, or than Fig. 16 vertebne from the 

 anterior part of the column. Fig. 14 a, lateral view of 14; 15a, lateral view of 15. 



Fig. 14 6. — Po.sterior extremity of last vertebra of 14; 16a, posterior view of posterior vertebra of 16. 

 166, anterior view of anterior vertebra of 16. From N. E. Colorado. 



