1898.] Osborn^ Remounted Skeleton of Phenacodus primcBvus. 103 



Table ob^ Measurements. 



Length, chin to perpendicular line of tail. . . . 



Length, chin to ischiac symphysis 



Length skull, condyles to symphysis of pre- 



maxillje 



Height, dorsal spines at withers 



Height, dorsal spines at hips 



Limbs, total length of hind limb, outside 



measurement 



Limbs, total length of fore limb, outside 



measurement 



Euprotogotiia puercensis thus appears to be about one-half the 

 size of P/ienacodus primcei'us in 3l\\ its measurements. As shown 

 in Fig. 4, the lateral digits are considerably longer, reaching the 

 ground. 



'^■^. 



Fig. 4. Skeleton of Euprotogonia pKcrcensis as now mounted, with missing parts restored 

 in outline from Phenacodus. One-twelfth natural size. Same scale a.s P. prhnavus. 



Comparison with Euprotogonia. 



Euprotogonia. 



[Torrejon.] 



(i) Caudals 18 preserved, neural arches 

 complete in C 1-8. D. L. formula 

 unknown. 



(2) Fore-limb. Posterior face of ulna 



convex. (C.) 



(3) Ectepicondylar ridge prominent. {C.) 



(4) Magnum very small. (C.) 



(5) ? Os centrale. (C.) 



(6) Trapezoid very short. (('. ) 



(7) Terminal phalanges laterally com- 



pressed, intermediate between 

 hoofs and claws. 



(8) Hind-limb. Femur with sharp and 



prominent patellar trochlea. 



Phenacodus. 



[\V.-\SATCH.] 



Caudal formula indeterminate. 

 Neural arches complete anteri- 

 orly. D. L. = 20-21. 



The same, concave. 



The same. 



Magnum som.ewhat enlarged. 



The same wanting. 



The same somewhat enlarged. 



Hoofs fully formed in P. prinuc- 



tnis. 

 More compressed in /'. ( 'rrispons- 



dylus) ivortmani. 

 The same. 



