OF NEW JERSEY, 29 
anteriorly. The object of this structure remains unex- 
plained, The whole hind leg could not have been less 
than six feet, eight inches in length. 
Fragments of the jaws indicate a face of very consider- 
able length, showing shining saw-edged, knife-shaped 
teeth ; but any nearer idea of. the beast’s expression can- 
not now be attained. If he were warm-blooded, as Prof. 
Owen supposes the Dinosauria to have been, he undoubt- 
edly had more expression than his modern reptilian proto- 
types possess. He no doubt had the usual activity and 
vivacity which distinguishes the warm-blooded from the 
cold-blooded vertebrates. 
We can, then, with some basis of probability imagine 
our monster carrying his eighteen feet of length on a leap, 
at least thirty feet through the air, with hind feet ready to 
strike his prey with fatal grasp, and his enormous weight 
to press it to the earth. Crocodiles and Gavials must have 
found their bony plates and ivory no safe defence, while 
the Hadrosaurus himself, if not too thick skinned, as in the 
Rhinoceros and its allies, furnished him with food, till 
some Dinosaurian jackalls dragged the refuse off to their 
swampy dens. 
This carnivore, then, is an interesting link between 
those of the mammalian series, and the carnivorous birds. 
In the first, all four limbs are equally developed, and sim- 
ilarly employed as weapons of offence; in the last, the 
functions of the anterior pair are altogether different from 
those of the hind a which are atone armed for the 
capture of food. In the Dinosaur, the hind limbs appear 
to have served the same purpose as in the Raptorial bird, 
while the fore limbs are simply miniatures of the same, 
and chiefly of service in carrying food to the mouth. 
- It will readily occur to the paleontologist, that the ex- 
