638 



APPENDIX B 



Fig. B.6. Free-living flatworms (Platyhelminthes, class Turbellaria). Left, the fresh-water 

 triclad Planaria; right, the marine polyclad Yungia aurantiaca. {Courtesy General Biological 

 Supply House, Inc., and American Museum of Natural History, respectively.) 



Fig. B.7. The dog and cat tapeworm, Taenia pisiformis (Platyhelminthes, class Cestoda.) 

 The larvae encyst in the liver of rabbits; the adults occur in the intestines of rabbit-eating 

 mammals. Left to right: the attaching "head" (scolex) ; young segments (proglottids) from 

 the middle of the worm; mature egg-filled segments from the end of the worm, ready to be 

 shed. (Courtesy General Biological Supply House, Inc.) 



