DRAGONS OF OLD TIME 129 
generation with fuller knowledge derived from first evidence. 
We insert here an illustration (see Fig. 40) in which are shown, 
side by side, the limb-bones and those of the region of the pelvis 
in a crocodile, a dinosaur, and a bird. (The middle drawing is 
not complete and the leg of the crocodile should be more bent.) 
Professor Marsh has described some remains of certain small 
and slender little Dinosaurs (Hallopus) about the size of a fowl, 
which, from the construction of their feet, he believes were 
Fig. 40. — Hind limbs of (a) Bird, (b) Dinosaur, and (c) Crocodile. 
capable of jumping. It is a question not yet decided whether 
Dinosaurs laid eggs. 
The late Sir Eichard Owen, in his great work on British Fossil 
Reptiles, made some valuable remarks on the probable habits of 
Dinosaurs, which deserve careful attention. He points out that 
actual observation of a swimming crocodile testifies to the fact 
that the fore-limbs are laid flat and motionless upon the sides of 
the chest. Their chief swimming organ is, of course, the tail, 
which is both long and powerful, and, in some forms, is flattened 
in a vertical direction. Most of the Dinosaurs at present known 
have the crocodilian swimming organ ; and some, such as the 
K 
