62 



Hadrosdurus and other genera l)eing absent. The area of the ailieiilnr car- 

 tilage is clearly marked out, and the dense snrface ol' 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 longitiidinally 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 

 Yarious reasons why it is more probably femur or humerus. The presence ot 

 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 cneinial crest, the other posterior, and replaced by a short 

 truncation. The inner (convex) flrce 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 strise seen in tlic femur. The distal end is nnsymmetrically lenticu- 

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

 ing a fixed ligamentous articulation with the astragalus. The convex iiice of 

 the shnft 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 ])art of the shnft. 



Miitr.uvcinnti:!. 



Ti-.iDsverso iliameter: il. 



Of the coudyles of the Hiiiiar - (I. OH-i 



Of tbo shaft of tho femur 0. Of.:! 



Diiimeter, fore and aft : 



or the iiiidclU) of the condyles 0. (J54 



Of the side of the condyles U. 001) 



Of the shaft 0.0?8 



Diameter of the head of the tibia: 



Greatest (1.102 



Fore and aft 0. 091! 



Transverse 0. UOO 



Diameter of the shaft of tibia ((iroxinially) : 



Transverse 0. OoO 



Foreandaft 0.045 



Diameter of the distal end of the tibia : 



Transversely 0. 1 15 



FortJand afc 0. 0(iO 



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

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

 in Hadro^diiyns fau/hri. \\\h\ iiidifiite an aniniid as lar<fe as a imrse. 



