FIELD BOOK OF PONDS AND STREAMS 



Fig. II. — Brightly colored, 

 red, orange, spider-like ani- 

 mals running over submerged 

 plants and on the bottom. 



Water-mites (p. 175). 



Fig. 12. — Jointed animals 

 of many shapes and sizes, 

 most of them with 6 legs on 

 the thorax even in their im- 

 mature stages. Young and 

 adult often very different. 



Water insects (p. 179). 



Fig. 13. — Animals of many 

 sizes bearing a shell, i -piece 

 and twisted, or 2-piece and 

 hinged. 



Snails and mussels (p. 301). 



Fig. 14. — Back-boned ani- 

 mals with fins supported by 

 jointed rods of cartilage; 

 breathing by blood-gills 

 throughout their lives. Usu- 

 ally scaly. 



Fishes (p. 324). 



Fig. 15. — Back-boned ani- 

 mals with limbs provided 

 with fingers and toes; soft, 

 skinned without scales ; young 

 breathe by gills, adults have 

 lungs. 



Salamanders, frogs, toads 



(p. 347). 



Fig. 16. — Back-boned ani- 

 mals with scaly skin, often 

 covered with bony plates; 

 breathe by lungs throughout 

 their lives. 



Turtles and snakes (p. 389) . 



