62 



Hadrosaurus and other genera being absent. The area of the articular car- 

 tilage is clearly marked out, and the dense surface of the shaft is marked with 

 delicate striae, which terminate at the edge of the former. One side of the 

 end of the bone is nearly plane, the other is longitudinally excavated ; some 

 shallow grooves furrow the angle with the trochlear face. The section of the 

 shaft, three inches from the end, is a wide, transverse parallelogram. This 

 bone looks no little like the distal end of a metapodial bone, but there are 

 various reasons why it is more probably femur or humerus. The presence of 

 the tibia, especially, determines it to be the former element. 



The head and distal end of the tibia, with six inches of the shaft, are pre- 

 served. The former relates with the end of the femur, resembling it both in 

 size, simplicity of contour, and details of surface. The form is crescentoid ; 

 one horn being the cnemial crest, the other posterior, and replaced by a short 

 truncation. The inner (convex) face is rendered angular by a median tuber- 

 osity, and all round this margin shallow grooves cut the solid angle at irreg- 

 ular distances. The articular face displays the smooth area, and the shaft the 

 delicate strife seen in the femur. The distal end is unsym metrically lenticu- 

 lar in section, one side being more convex; the articular face is rugose, show- 

 ing a fixed ligamentous ai-ticulation with the astragalus. The convex face of 

 the shaft is coarsely striate-grooved near the extremity ; on the other side, the 

 intervening ridges are represented by exostoses or rugosities. The flatter side 

 becomes the more convex on the lower part of the shaft. 



Meaxurcmenis. 



Transverse diameter: n. 



Of the condyles of Che femur 0.08:2 



Of the shaft of the femur .' 0.0:".;! 



] liaineter, lore and aft : 



Of tli. • middle of 1 lie condyles 0.054 



Of the side of the condyles 0. 0(ii) 



Of the shaft 0.0?8 



Diameter of the head of the tibia: 



Greatest 0. 102 



Fore and aft 0. 0D6 



Transverse 0.060 



Diameter of the shaft of tibia (proximally): 



Transverse 0.050 



Fore and aft 0. 04, r > 



1 lianieter of the distal end of the tibia : 



Transversely 0.115 



lore and aft 0. 0G0 



Remarks. — If the bones above described as pertaining to the hind limb 

 are really such, they are smaller as compared with the dorsal vertebrae than 

 in Hadrosaurus fou/kei, and indicate an animal as lanre as a horse. 



