346 



ANIMALS (>K IIIK PAST 



Fig. 223. — l'<jssil scorpion. 



the great (■oul-foriiiing period 

 of this era, we find traces of 

 spiders and several kinds 

 of insects; namely, locusts, 

 cocki'(.)aclics, and dragon flies. 

 Fishes. — Fossils are found 

 indicating that fishes came 

 into existence early in the 

 paleozoic ci-a, although not at 

 the beginning. These ancient 

 fishes \\'e[e vcrj' different 

 from those living to-day. 

 Their l)odies "were, for the 

 most part, covered with bony 

 plates or smooth, hartl, in- 

 flexilile scales, quite unlike 

 the scales on living fishes. 



b'w,. 224. -I'uluuzoic httli. 



lOij. 225. — I'alcozoic- fish. 



