PLATE LVIII. 



All the figures natural size. 



Figs. 1, 2. — Hyraeotherium craspedoium. Page 631. 



Fig. 1. — Cranium viewed from below. 



Fig. a. — Right inaudible of a second specimen, the one on which the species was determined; inner 



side; a, from above. 

 Figs. 3-5.—Lambdotheriumpopoagicum. Parts of several indivi<luals. Page 710. 

 Fig. 3.— Superior molars of left side; a and c, from the individual tigured in Fig. 4; b, from a second 



animal. 

 Fig. 4. — Superior molars of right side. 

 Fig. b.—Hepiodon ventorum, left mandibular ramus of left side, witli the last inferior molar of specimen 



No. 2 added in place. Page 654. 

 Figs. 6, T.—Hyrachijus impUcatus Cope. Part of skull, from the Mammoth Bnttes; right side; a, right 



maxillary teeth from below. Page 676. 

 Fig. 7. — Eight mandibular ramus from above. 



Figs. Sr-10.—Phenacodu9 vortmani. Three individuals ; from the Wind River bad lands. Paga 464. 

 Fig. 8. — Last two inferior molar teeth in portion of jaw, from above. 

 Fig. 9. — Anterior part of m.andible from above, of the specimen on which the species was based ; a, 



inner view of same. 

 Fig. 10. — External view of maudible of a third individual. 

 Fig. 11. — Phenacodus var. trilobatus, type, inner view ; a, superior view. 



