i:\ii\ii n PE OF I"".. ."> 



tion with the humerus, it is remarkable for its length, which is to the hume- 

 rus as I LO to 100. The s.-nur proportion in the fox is as 66 to LOO; in the 

 coyote as 74 to LOO; in the wolf as 76 to 1<><»: in the bull terrier and New- 

 foundland dog as respectively 80 to LOO. The relative length of the scap- 

 ula, compared to the humerus, is thus 30 percent, greater than in one of 

 the mosl thickly-sel races of domestic dog (bull terrier), 35 per cent. . 

 than in the coyote and wolf, and J 1 per rent, greater than in the fox. This 

 proportion between scapula and humerus results uot so much, however, from 

 the lengthening of the scapula as from the excessive shortening of the 

 humerus, which, like the femur and tibia, is very short and thick. 



Measi ; in: Scapula. 



Extreme length 



breadth 



Antero-posterior diameter of glenoid cavity 



1 i -•■ diameter ol glenoid cavity. . .' 



height of spine 



•The measurements given in these tables are in millimetres. 



_ 9 



17 in 







51 

 22 

 1 1 

 17 



116 

 61 

 23 

 16 

 19 



c — 

 =. i 



L69 



v., 



34 



23 

 26 



Mi MEKUs(pl. II, figs. I — 6). — The humerus differs from this bone in the 



ordinary Canids in it- i -h greater thickness in proportion to its length, 



in its stronger curvature, and in the supracondylar fossa being imperforate, 

 the usual broad foramen .it this point being solidly closed by a heavy plate 

 of bone. All of the ridges and tuberosities are strongly developed; the 

 front border of the head forms a heavy overhanging ridge, and the deltoid 

 ridge terminates in s broad, strongly projecting process (pi. II. figs. 2 — •"*). 

 The absence of the supracondylar foramen, so characteristic of the family 

 Canidee, is especially noteworthy; bul its value as a distinctive feature in 

 the present species is lessened by the fact that it is sometimes partly, and 



in rare instances wholly, closed inoldag in the do stic dog. Lt should 



be noted, however, that it is similar!) absent in Ampkicyon. 



The following table of measurements of the humerus shows the relative 

 dimensions of this bone not only in the present species, but in the fox, 

 coyote, wolf, and in two widely different races of dogs. In respect to 



