82 MEMOIRS OF THE CARNEGIE MUSEUM 



rior and posterior transverse processes. The rugosities for the chevrons continue 

 prominent. 



Of the remaining caudals all are represented in our series but the sixteenth and 

 one or more of the distals. The twenty-first is shown in Fig. 12, PL XVII. It is 

 reduced to a slender rod of bone and is evidently from near the posterior extremity 

 of the tail. There is only one smaller in our series. 



Measurements. 



Length of centrum of first? caudal 19 mm. 



Expanse of transverse process of same vertebra 61 



Length of centrum of fifth? caudal 35 



" " " seventh? caudal 40 



" " " " ninth? " 44 



" " " " thirteenth? caudal 44 



The Sternum, Pl. XVIIL, Fig. 1. 

 The sternum in our skeleton is represented by five of the mesosterni. I have 

 interpreted these as the anterior. Assuming that there were present in the sternum 

 of Daphoenas six mesosterni, the normal number alike in the canidse and felidse, 

 there is wanting but one of these bones. This, together with the presternum and 

 xiphisternum, both of which are wanting in our skeleton, would complete the 

 sternal series. These bones are rather more slender than in recent dogs of the same 

 size, but they are of the same general character. Their combined length is 132 mm. 



The Oh Penis, Pl. XVIIL, Figs. 4, 5. 



Daphcenus, as well as Gynodictis, was possessed of a remarkabl}'- well developed 

 and highly specialized os penis, even surpassing that which obtains in the modern 

 raccoons. As regards the development of this bone Daphceiius was preeminently 

 canine rather than feline in character. 



The OS penis, throughout the proximal two thirds of its length, is elliptical in 

 cross-section with the greater diameter directed vertically. Proximall}^, it is much 

 compressed into a flattened, wedge-shaped, very rugose extremity, for muscular 

 attachment to the pubes. Distally, this bone becomes more cylindrical in cross- 

 section, and at about the middle of its length a shallow groove appears on its inferior 

 surface. This gradually becomes more pronounced, giving rise anteriorly to a deep 

 channel, and at a distance of 10 mm. from the extremity the bone is entirely bi- 

 sected, and sends forward the two peculiar spout-like processes shown in Fig. 5, Pl. 

 XVIIL, each with a shallow groove on its internal surface, 



