PI. I. — Winter life in a brook; a section through swift flow- 

 ing shallows. I, stonefly, TcBniopteryx; 2, water cress; 3, alga; 

 4, sponge gemmules; 5, caddis worm; 6, caddis worm, Hydro- 

 psyche {Macronema); 7, planarian, Dendroccelum: 8, cranefly 

 larva; 9, water penny; 10, Corydalis larva; 11, dusky sala- 

 mander. 



