MESOZOIC AND CENOZOIC LIFE 433 
ment of flowering plants there came a great increase in 
insect life, so that by the close of this period the vari- 
ous types of insects now known had appeared. 
Skeleton of Brontosaurus. A Juratrias reptile. 
Cenozoic Life. —In the Cenozoic, the forms of life, 
both on land and sea, began to closely resemble those 
which are now known. ‘This was distinctly the J/odern 
Age of life history on the earth. The illustrations 
AGREES 
Ward’s cast of skeleton of Ichthyosaurus; a Juratrias reptile. 
(Plates 22 to 24, and Fig. 258) show that the inver- 
tebrate life was quite like that of the present ocean. 
On the land the most remarkable development is among 
the mammals, and this is very appropriately called the 
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