354 APPLIED BIOLOGY 



fishes, and sea-urchins. Reference will be made to all of 

 these in the succeeding lessons. 



Important Groups of " Worms" 



Platyhelminthes flat worms, tape-worms. 



Nemathelminthes round worms, Trichina. 



Annelida segmented worms, leech, earthworm. 



These are phyla or primary groups equivalent to Protozoa and 

 Coelenterata. For other phyla of worm-like animals, and for sub- 

 divisions of each phylum, advanced books of zoology should be 

 consulted. 



