Fig. a. 



Fig. B 



Fig. C. 



Plate IV. — Restorations of archaic mammals. A, cursorial type, Phenacodus 

 primcenjus'^ B, swamp-dwelling amblypod, Coryphodon-^ C, four-horned 

 amblypod, DinoceraSy the culmination of its race. After Lull. 



