184 



THE MAMMALIA OF THE DEEP KIVEU BEDS. 



Explanation of the Plates. 



Plate I 



Cynodcsmus thooides : Skull, side view, x f ■ Lower beds of Deep River. 



" " Skull, top view. X f. 



" " Skull, front view X f. 



" " Superior dentition, crown view, natural size. 



" " Inferior dentition, crown view, natural size. 



3/iohippus annectens ? Marsh : Left femur, front view. X i- G a , Proximal end of left femur. 



" " " Left tibia. J'', fibula. 7<*, Distal end of tibia and fibula, natural size. 



" " " Part of left pes, from inner side. X §■ 1 + 2, coalesced ento- and 



mesocuneiforms. Lower beds of Deep River. 



Plate II 



Fig. 

 Fig. 

 Fig. 

 Fig. 



Fig 

 Fig. 

 Fig. 



Fig. 



Fig. 

 Fig. 

 Fig. 

 Fig. 



Fig, 



9. Desmatippus crenidens : Right upper molar-piemolar series from the outer side. X §. 



10. " " The same, crown view, natural size. 



11. " " Left mandibular ramus, from outer side, x §• 



12. " " Left lower molar-premolar series, crown view, natural size, a, a 1 , anterior pillars 



of Rutimeyer. 



13. " " Manus. X i- 



14. " " Right pes, from inner side. X }. 1 + 2, coalesced ento- and mesocuneiforms. 



15. JUesohippus Bairdi Leidy : Specimen of left pes, showing the three cuneiforms coossifled (C 1 + 2 -J- 3); 

 natural size. White River beds of South Dakota. 



1C. Miohippus sp. : Specimen of right pes, showing the very elongate and depressed ungual phalanx. X i- 

 John Day beds of Oregon. 



17. Protohippus sp. : Portion of right manus. X |. U, ulna ; Sc, scaphoid ; Cn, cuneiform. Upper beds of 

 Deep River. 



18. Anchitlierium equinum : Atlas from ventral side. X J. Upper beds of Deep River. 



19. " " Fragment of axis, from the side. X i- 



20. " " Lumbar vertebra, from behind. X ^. 



21. " " Proximal end of humerus, x i- Be T, bicipital tubercle. 



22. " " Radius and ulna, distal end. X f. 



Plate III 



Fig. 23. Ancliiiherium equinum : Skull, side view, x £. Upper beds of Deep River. 



Fig. 24. " " Upper dentition, crown view. X f. Cn, cingulum of incisor. 



Fig. 25. " " Lower dentition, crown view, x I- 



Fig. 26. " Humerus, front view. X J. Be T, bicipital tubercle. 



Fig. 27. " " Ungual phalanx of iii digit, from the side. X §. 



Fig. 28. " " Phalanges of ii digit, from the side. X §. 



Fig. 29. Mesoreodon ehelonyx : Hyoid apparatus, natural size. St H, stylohyal ; Ep H, epihyal ; C H, ceratohyal ; 



O, glossohyal process of basihyal ; Th H, thyrobyal ; T O, thyroid cartilage of larynx. Lower beds of 



Deep River. 



