The document summarizes three types of worms: flatworms, tapeworms, and roundworms. Flatworms are bilateral and unsegmented with some having a primitive brain. Tapeworms are parasitic and can be very large, living in the intestines without digestive or nervous systems. Roundworms number in the thousands of species and can feed on decaying or living tissue. They are also bilateral and unsegmented.

1. Worms Flatworms, Annelids, & Polychaeates

3. Phylum platyhelminthes Class turbellaria

9. Class Cestoidea The tape worm

13. Phylum Nematoda Roundworms

22. Class polychaetes