Fia. 25. Ribs of Left Side of D. superbus, 4 
nat. size. 1, first rib, type No. 1589; 2, second 
rib No. 1589a; 3, third rib No. 1589a; 5, fifth 
| rib No, 1589a ; 6, sixth rib No. 1589a. 
ward. The ventral face is produced 
into a heavy rounded antero-posterior 
ridge, which gives the bone a strong 
: 230 MEMOIRS OF 
THE CARNEGIE MUSEUM 
rior region of the thorax the ribs have large capitular and tubercular articulations 
and rather flat shafts as in Canis, while pos- 
teriorly they are more cylindrical ; the eley- 
enth, twelfth, and thirteenth having no tuber- 
cular articulations. 
Sternum.— The sternum is represented 
only by the manubrium, which is more nearly 
like that in the tiger than in the dogs. Thus 
its size is proportionately large and it is greatly 
produced in front and much expanded trans- 
versely at the attachment for the first pair of 
ribs. In front of the rib facets the superior 
face has a subtriangular area which is concave 
from side to side and also slightly concave an- 
tero-posteriorly. In front the bone terminates 
in an obtuse, laterally compressed process, 
which projects forward and slightly down- 
keel-like appearance. The posterior 
half of the presternum is more angular — yg, 26, Presternum of D. superbus. } nat. size. 1, 
on cross-section. 
dorsal view ; 2, ventral view ; 3, lateral view. 
MEASUREMENTS OF PRESTERNUM. 
Greatest length 
‘Transverse diameter at first rib facets.. . 3: 
Vertical diameter at first rib facets...........sceseccsssseesereeeeeseeseneerseeseerananeeeecees . 16 
THE Os PENIS. 
q The os penis which is so well developed and characteristic in Daphanus is not 
less so in Daphenodon. With the type and the younger skeleton there was found 
the anterior portion of an os penis (Fig. 27, 2) which I judge might belong with the 
young individual. The portion of the shaft present is sub-cylindrical in cross- 
section, with a sinuous curve and deeply grooved near the bisected end. 
