116 Prof. H. G. Seeley on the 



■which wants the inferior callosity, is less compressed from side 

 to side. These remarkably compressed claws are a character 

 of some importance in defining the genus Massospondylus. 

 They distinguish it readily from Euskelesaurus, just as the 

 absence of the proximal externo-anterior trochanter distin- 

 guishes the femur, and the comparatively small size of the 

 head of the bone distinguishes the tibia from that genus, 

 which is also separated by the form of its distal end. 



The Humerus. (Fig. 12.) 



The humerus is a broad flat bone with transversely ex- 

 panded ends and a slender shaft, which, in its general form, 

 approximates towards that figured by Sir K.. Owen as Dicy- 

 nodon tigriceps. There are, however, many approximations 

 in the skeletons of Saurischia and Anomodontia. I infer 

 that the length of the bone did not exceed 11 inches, so that 

 it would be much shorter than the femur. No. 354 (fig. 12) 

 is the proximal end of the right humerus, no. 356 is the distal 



Fig. 12. 



Proximal articular surface. 



Distal articulation. 



Restoration of the right humerus. -^ nat. size. The middle of the shaft, 

 •which is lost, may be shorter than the dotted space between the two 

 ends. No. 354. 



end of the right humerus, apparently the same bone. The 

 proximal end of the bone 'is transversely expanded, the arti- 

 cular end being directed inward and thickened, as in Palceo- 

 saio-iis, while the radial crest is similarly directed downward ; 

 but the shaft of the bone appears to have been relatively 

 wider and the distal end to have been modified by greater 

 transverse expansion. The width of the proximal end, as 



