WATER PLANTS AND ANIMALS 





Fig. 5.— Soft, grayish or 

 black worms. Creeping on 

 under sides of stones. Gen- 

 erally less than one-quarter 



inch long. 



Free-living flat worms (p. 



119). 



Fig. 6. — ^Microscopic ani- 

 mals on stones and plant 

 stems or swimming near the 



Wheel animalcules (roti- 

 fers) (p. 127). 



Fig. 7. — Colonies of ani- 

 mals, vine-like on under sides 

 of stones, or rug-like beneath 

 lily pads, or masses of jelly 

 hanging in open water. Col- 

 onies one-half inch across 

 up to 15 inches thick. 



Moss animalcules (bryo- 



zoans) (p. 131)- 



Fig. 8.— Transparent 

 worms, one-half inch long or 

 less; swarming over muddy 

 bottoms; red worms up to 

 1-2 inches long, and hair-like 

 worms 1-2 feet long. 



Threadworms and bristle- 

 worms (p. 139)- 



^f^S^K^ 



_^^^^^^^^S3B^ \f^ 



Fig. 9. — Flattened, worm- 

 like animals with a sucker at 

 each end. Clinging to stones 

 and sticks, often on legs of 

 turtles. Mostly 1-3 inches 

 long. 



Leeches (p. 140)- 



Fig. 10. — Many -30 in ted 



animals breathing by blood- 

 gills; (a) microscopic, (b) i 

 inch, or (c) several inches 



long. ^ . , . 



Water-fleas, fairy shrimps, 

 crayfishes, etc. (crustaceans) 

 (p. '158). 



