124 Prof. H. G. Seeley on some Vertehrce and 



Crag as Ilortalotarsus, in whicli the proportions of such of the 

 foot-bones as can be compared are almost identical. This is 

 the more interesting, since that fossil is manifestly very 

 unlike lifassospondi/lus in the form of the distal end of its 

 tibia, and on that basis is referred to a different genus. 



Femur. (Figs. 13 and 14.) 



Mr. Brown collected botli the right and left femora, which 

 are fully 9^ inches long. Both bones are slightly distorted, 

 and the right femur is obviously compressed at the proximal 

 end, while the left is somewhat compressed at the distal end. 

 The bone is Megalosaurold in type, in having the articular 

 head bent inward at an angle to the distal end, so as to look 

 inward and forward ; it is rounded from within outward, and 

 at about f of an inch below the proximal extremity on the 

 inner side there is an impressed area continuous with the 

 shaft which defines the head of the bone. The external 

 trochanter is but slightly developed ; it forms a ridge on the 

 externo-anterior border, fully 1^ inch below the proximal 

 articulation. It is but slightly elevated, widens as it 

 descends, and is traced for fully an inch in length. Seen 

 from the side the bone has a sigmoid curve, owing to the 

 proximal head being bent forward, the body of the bone 

 curving forv/ard and upward and the distal end being 

 directed backward and downward. The greatest measure- 

 ment of the proximal end from within outward and its greatest 

 transverse measurement is If inch. The internal lateral 

 trochanter is compressed from side to side as usual, and 

 directed vertically inward and downward ; it is 1^ to If inch 

 long, and approaches within less than 3 inciies to the proximal 

 end and 5 inches from the distal end. The bone is 

 rather compressed in the shaft from side to side, so that it is 

 deeper than wide, nearly vertical on the external side, flattened 

 in front at the distal end. The distal extremity is well 

 rounded from front to back, with two well-developed condyles, 

 divided from each other by a moderately deep notch. The 

 depth of the bone is here 1| inch in the left femur. The 

 internal condyle appears to be the larger; there is a com- 

 pression on the hinder border of the external condyle. The 

 breadth of the distal end of the bone, as preserved, is nearly 

 If inch. 



The distinctive features of this femur are, first, the ovate 

 form of the articular head seen from above, which has some 

 resemblance to j\Iassospondylus ; but the proximal end is not 

 so broad as in Massospondylns carinatus^ nor is the distal end 



