PLATE LVIIA. 



Figs. I-IG.—Phenacodiis primaevus, from the specimen figured LVII e; two-thirds uatural size. 



Figs. 1-5. — The first five cervical vertebrie, from below ; a, jjosterior views ; 6, anterior views. 



FigH. 6-7. — Eleventh and twelfth dorsal vertebne from below; ft, anterior view of the eleventh, with a 



fragment adhering to the neural arch. 

 Figs. H-11. — Last dorsal and first three liuul>ar vertebra; from below; a, i)osterior views; ft, anterior 



views. 

 Figs. l-i-l;j.— Last two lumbar vertobraj from below; a, posterior view of last lumbar. 

 Fig. 14. — Sacrum with right ilium and parts of ischium and pubis from below. 



Figs. 15-16.— Two adjacent caudal vertebra;, the fourth and fifth from the sacrum; fi, anterior view. 

 Fig. 17— Phenacodus vorimani, left tarsus of specimen figured in Plate XXIX e, exterior side, two-thirds 



natural size; a, proximal oxfremities of the metatarsals. 



