64 
and protrudent in front. The inner one is the larger of the two and thicker 
both in front and behind. Its fore-and-aft diameter is equal to the maximum 
combined condylar breadth. The condyles are separated below by a 
deep groove which behind continues up between them to the shaft and 
in front widens into a large concavity. Posteriorly on the shaft, toward 
the inner side, at about one-third of the bone's length from the top, there 
Figure 34. Right humerus of para type of Edmontosaurus; i natural size. A, anterior aspect; 
B, posterior aspect; C, outline of proximal end; D, outline of distal end; ant, anterior; h, head; itb\ 
inner tuberosity; oc, outer condyle; olb, outer tuberosity; rc, radial (deltoid) crest. 
is a prominent, roughened, vertical ridge for muscular attachment. Also 
the lateral surfaces of the distal end of the bone, and the border, and 
external face, of the radial crest in its lower part are coarsely striated for 
muscles. As the radial crest is directed obliquely outward and forward 
it is foreshortened when viewed as in Figure 34, A and B, and appears 
narrower than it really is. 
