86 O. C. Marsh—Classification of the Dinosauria, 
respects the most strongly marked division of the Dinosaurs, 
has in Scelidosaurus a form with some features pointing strongly 
toward the Ornithopoda. 
The Carnivorous Dinosauria now best known may all be 
canta at present in a single order, and this is widely separated 
rom those that include the herbivorous forms. The two sub- 
orders defined include very aberrant forms, which show many 
points of resemblance to Mesozoic Birds. Among the more 
fragmentary remains belonging in this order, but not included 
in the present classification, this resemblance appears to be 
carried much farther. 
The order Hallopoda, which I have here referred to the 
Dinosauria, with doubt, differs from all the known members of 
that group in having the hind feet especially adapted for leap- 
ing, the metatarsals being half as long as the tibia, and the cal- 
caneum produced far backward. This difference in the tarsus, 
however, is not greater than may be found in a single order of 
Mammals, and is no more than might be expected in a sub-class 
of Reptiles. 
m 
this formation, there appears to be at present no satisfactory 
evidence of the existence of any Dinosauria. 
* Quarterly Journal Geological Society of London. Vol. xxvi, p. 34. 1870. 
