24 ANIMALS OF THE PAST 
sibly be eaten out of existence but for the fact 
that they are covered—some of them very 
completely — with plate- armor that enables 
them to defy their enemies, or renders them 
such poor eating as not to be worth the taking. 
<P es 
MOSS 
WSS 
Fig. 4.— Cephalaspis and Loricaria, an Ancient and a 
Modern Armored Fish. 
The arrangement of the plates or scales in the 
living Loricaria is very suggestive of the series 
of bony rings covering the body of the ancient 
Cephalaspis, only the latter, so far as we know, 
had no side-fins; but the creatures are in no 
