0. C. Marsh—On Dinosaurian Reptiles. 485 
Another group of extinct Reptiles, which may be termed 
the Belodontia, were considered in the same paper, as allies of 
the Dinosauria. They are known from the Trias of Europe 
and America, and the type genus Belodon has been investi- 
gated by many anatomists, who all appear to have regarded it 
as Crocodilian; an opinion that in the light of our present 
knowledge may fairly be questioned. 
FigurE 2.—Diagram of left hind limb of Alligator Mississippiensis, Gray; seen 
from the left; in position for comparison with Dinosaurs. One-fourth 
natural size. 
FigURE 3.—Diagram of left hind limb of Aétosaurus ferratus ; in same position. 
One-half natural size. 
The relations of these various groups to the true Crocodiles 
on the one hand and to Dinosaurs on the other is much too 
broad a subject to be introduced here, but I may at least call 
your attention to some points of resemblance between the 
Dinosaurs and these supposed Orocodilian forms, that seem to 
indicate genetic aftinities. 
