THE DINOSAURS 95 
Professor Marsh, and seized upon by the news- 
papers, which announced that he had discov- 
ered a Dinosaur with a brain in its pelvis. 
In their great variety of size and shape the 
Dinosaurs form an interesting parallel with 
the Marsupials of Australia. For just as 
these are, as it were, an epitome of the class 
of mammals, mimicking the herbivores, car- 
nivores, rodents and even monkeys, so there 
are carnivorous and herbivorous Dinosaurs — 
Dinosaurs that dwelt on land and others that 
habitually resided in the water, those that 
walked upright and those that crawled about 
on all fours ; and, while there are no hints that 
any possessed the power of flight, some mem- 
bers of the group are very bird-like in form 
and structure, so much so that it has been 
thought that the two may have had a common 
ancestry. 
The smallest of the Dinosaurs whose ac- 
quaintance we have made were little larger 
than chickens; the largest claim the distinc- 
tion of being the largest known quadrupeds 
that have walked the face of the earth, the 
giants not only of their day, but of all time, 
