PLATE V. 



Fisbes, natural size. 



Figs. 1,2.—Iihvwastes})eltatus. Occipito-paiietal bone, Irom above; tlie anterior extremity of contact 



Tvitli the frontal is entire ; a, from below ; h, from behind, showing the nuchal prolongation. Page ()3. 

 Fig. 2. — Dorsal spine, both ends wanting, left side; a, front ; b, posterior aspect. 

 Figs. Z,4.—Khincaste8 calvus. Page Glj. 

 Fig. 3. — Cranium inferentially restored from three fragments from the extremities, and auterior median 



portion; superior surface; n, from below ; b, posterior view. 

 Fig. 4. — Adjacent parts of dorsal spine and its supporting intemeural bone. 

 Figs. 5-11. — Ilhineasles amithi. Three individuals represented by Figs. 5-9, 10, and 11, respectively. 



Page 64. 

 Fig. 5. — Uasioccipital from below. 

 Fig. G. — Anterior vertebral mass, from below. 

 Fig. 7. — Dorsal vertebra, articular face; a. Literal view. 

 Fig. 8. — Articular cotylus of mandible, from above. 

 Fig. 0. — Pectoral spine, from side; o, from behind. 



Fig. Ifl. — Pectoral spine of another individual, from the side; n, from behind. 

 Fig. 11. — Part of dentary bone of another specimen, external view ; a, vertical view. 

 Fig. 12. — Pectoral spine of Hhincastts arcuatiis, lateral view; a, posterior view. Page (50. 

 Fig. 13. — Ehincasteg pcctinaius. Inferior view of anterior part of skeleton. From Florissant, Colorado. 



Pago 747. 

 Figs. 14-17. — Fragments of skull of f Ithiucuslcs raduhm, from near Fort Bridger. Page G7. 

 Figs. 18-20. — DapedogloHSUs acuius. Page 72. 



Fig. 18. — Left dent.ary, hacking the posterior portion, external view; a, superior aspect. 

 Fig. 19. — Dentary bone of a second specimen, inner side ; a, from above. 

 Fig. 20. — Palatine ))one of a third individu.il. 

 Fig. 21. — Ainijzon commune. Typical speoimen, from Florissant, Colorado. Page 749. 



