HATCHER : OLIGOCENE CANID^ . 83 



In Cynodictis this bone is grooved throughout nearly its entire length. The 

 distal extremity is not bifurcated as in Daphoenus, but is solid, abruptly curved, and 

 terminates in much the same manner as in Procyon lotor. The dimensions of 

 these bones in Daphcenus and Cynodictis are as follows : 



Length of os penis in Daphcenus 166 mm. 



" " " " Cynodictis 120 " 



Depth of OS penis in Daphcenus at proximal end 16 " 



" " " " Cynodictis " " 9 " 



The Ribs. 

 Most of the ribs are represented and several are quite complete. The anterior 

 are short but proportionately very stout. Throughout the series they are shorter 

 than in most modern dogs, with limbs of equal length, thus indicating a body cavity 

 of relatively small capacity. The greatest length of the best preserved ribs measured 

 along the cords of the arcs formed by the bones is as follows : 



First..... 45 ram. 



Second ^^ 



Third 83 " 



Fourth 98 " 



Sixth 105 " 



Seventh 119 " 



Ninth 123 " 



Tenth , •• 120 " 



The Fore Limbs and Feet. 



Unfortunately the scapulae are wanting in our skeleton and I am unable to give 

 the characters of this important bone. 



The Humerus. — F\. XIX., Figs. 7, 7^ and 8. Both humeri are preserved in 

 our skeleton and are nearly complete, though much crushed. They are decidedly 

 more cat-like than canine. In fact almost every character by which one could 

 with reasonable certainty distinguish a modern feline humerus from that bone 

 in the canidse is present, and were the humerus of Daphcenus found isolated 

 one would unhesitatingly refer it to some member of the felidse, thus showing how 

 unreliable a guide the comparative osteology of recent vertebrates may be to 

 the student of vertebrate paleontology. There is a large supra-condyloid fora- 

 men bounded internally by a strong supra-condylar ridge, a character always 

 found in the modern felidse and which would alone distinguish the humerus of a 

 cat from a dog. There is no supra-trochlear foramen, but the anconeal fossa is deep. 

 The external supinator ridge is developed into a broad and sharp ridge of bone ex- 



