72 ^ 



The ulna and radius, belonging to the same fore limb as the humerus, are figured 

 as they were found, 



The ulna has a strongly developed olecranon process terminating its expanded 

 proximal end which is concave on three sides so as to be subtriangular in section. From 

 the middle of its shaft downward, it increases in size very little. 



The radius is a comparatively slender bone but terminates below in a carpal articix- 

 lating surface slightly larger than that of the distal end of the ulna. 



Measurements of ulna arid radius. 



Extreme length of ulna (28 inches) . . . . 



Circumference at middle of shaft 



(ireatest breadth across coronoid process . 



Greatest thickness at proximal end 



Greatest diameter of carpal end 



Shortest diameter of carpal end 



Extreme length of radius (25 inches) . . . 



Circumference at middle of shaft 



Long diameter of head 



Short diameter of head 



Long diameter of carpal end 



Short diameter of carpal end 



M. 



70S 

 190 

 145 

 094 

 074 

 057 

 632 

 155 

 086 

 054 

 087 

 050 



The right femur, plate VIII, provisionally associated with T. viarginatus, is interesting 

 in many particulars, notably, its slenderness, the prominence of the head, the backward 

 extension of the condyles and the marked development of the third trochanter. The 

 inner condyle is larger than the outer one ; they are both, viewed from the side, 

 broadly rounded posteriorly and pointed in front. From the great trochanter, a promi- 

 nent ridge extends downward, for some distance on the outer front face of the bone. 



Measurements of femur. 



M. 



Length from top of trochanter to bottom of outer condyle 1 • 1825 



Length from top of head to bottom of inner condyle 1 • 1698 



Breadth of upper extremity.- '2464 



Breadth of lower extremity • 2497 



Transverse diameter at middle of shaft "145 



Antero-posterior diameter at middle of shaft "134 



Circumference below third trochanter ... •4048 



Circumference above third trochanter ■ 4774 



Antero-posterior diameter of head (imperfect) -127 



Antero-posterior diameter of trochanter ■ 209 



Antero-posterior diameter of inner condyle • 300 



Length of third trochanter -377 



Height at centre of third trochanter -047 



A comparison of this femur with that of Hadrosaurus fo7i'kii, Leidy reveals a great 

 similarity in their general proportions. If anything, the Red Deer river specimen is more 

 slender but otherwise there are no very marked difierences. 



