Peterson and Gii.more : Elosaurus Parvus. 



495 



teriorly with that (hamctcr siil>ci|ual throui^^hout its Icn^jth. 'I'hc head 

 of the femur is phxcecl at riL;hl angles to the shaft of the bone, in 

 which respect it most resembles the femur of Diplodocus} The head 

 is separated from the great trochanter by a slight constriction (see 

 Fig. 5), but blenils into the shaft without a well-defined neck. 



Fig. 5. Proximal end of right femur of Elosaurus parvus (No. 566), one-half 

 natural size. //, head ; !^J., great trochanter. 



The fourth*"' trochanter is very small, hardly more than a slight rugosity, 

 placed on the internal margin on the u])per half of the posterior side. 

 Distally the femur expands, giving rise to the external and internal 

 condyles, which are separated by a deep intercondylar groove. An 

 external condylar groove divides the external condyle in two parts. 

 See Fig. 6. 



Fig. 6. Distal end of right femur of Elosaurus parvus (No. 566), one-half nat- 

 ural size, e.c, external condyle; i.e., internal condyle; i.g., intercondylar groove; 

 g., groove which divides e.c. into two parts. 



Mkasurkments. 

 Greatest length of femur, 335 mm. 



Greatest breadth of femur, proximal end, 96 " 



Greatest breadth of femur, distal end, 94 " 



12,% inches. 



y^ " 



Fibula. — The fibula is a long slender bone and presumably much 

 lighter than the tibia. Transversely the diameter of the shaft remains 



* Hatcher. Memoir of Carnegie Museum, Vol. I, No. i, p. 47. 

 ^Sometimes incorrectly called the third. 



