WERE LAID DOWN 



moving clumsily through the swamps, made their appear- 

 ance, and others with stronger limbs pushed onwards 

 through the forest. Others in form resembling snakes 

 crept through the mud >d lived among the swamps 

 by the side of the^ear. ^ Not much is known of the food 

 and life-habits of any of these amphibians. From their 

 teeth we may perhaps judge that they lived on fish, 

 crustaceans, insects, and on one another, and their pre- 

 datory life sometimes led them to climb trees in search 

 of food. What, however, is most important about the 

 amphibian is that they were the pioneers of the march 

 of those creatures which had backbones the vertebrates 

 from the sea to the land. 



225 



