f 
240 MEMOIRS OF THE CARNEGIE MUSEUM 
Metacarpal ITI. —The third metacarpal is slightly longer than the fourth and 
is consequently the longest in the series. The proximal articulations of this meta- 
carpal as well as all the others are so placed that when articulated the distal ends 
spread very much more than in the recent dogs. his is also true of the metacarpals 
in Daphenus. Asin the latter genus the dorsal face of the proximal end has a 
rugose excayation for tendinal attachments, while that area in Canis is raised higher 
up and in place of the excayation there is a considerable eminence. On Me. IIT in 
Cynodesmus brachypus this eminence is also well developed. The shape of the dif- 
ferent facets of the proximal end are identical with those in Daphanus ; 7. e., the 
facet for the magnum is narrow and deep, that for Mc. II larger and more oblique 
Fia. 37. Dorsal and Radial Views of Right Metacarpal Fia. 38. Dorsal and Radial Views of Right Metacarpal 
III of D. superbus. Nat. size. IV of D. superbus. Nat. size. 
than in Canis, and the facet for Mc. IV larger and more angular near the proximal 
border. Asin Me. II the shaft is round and arched forward. The distal trochlea 
is narrower than in the dogs and the dorsal portion is more spherical, while the 
carina is very prominent. 
MEASUREMENTS OF METACARPAL IIT. 
Mm, 
Greatest length 
14 
Beat | 
Greatest antero-posterior diameter of head.. 
Greatest transverse diameter of head 
Metacarpal IV.— The general features of the head of Mc. IV are not unlike 
those of the third. The shaft, in fully adult forms however, is, characterized by 
the prominent rugosity for tendinal attachment on the ulnar angle, while in young 
individuals it is less noticeable. The shaft is arched in the dorsal direction and the 
distal end is similar to that of Me. III. 
