inthoduction to the higher invertebrates 243 



4. Distinguish an enterocoelom from a schizocoelom. 



5. What is a mesentery? 



Supplementary Reading 



Volumes I and II of The Invertebrates by L. Hyman contain an excellent discussion 

 of the relations among the major taxonomic groups and other discussion on the origins of 

 the metazoa. Buchsbaum has a superb collection of photographs together with a lucid 

 account of the invertebrates in Animals without Backbones. A similar account of marine 

 organisms, with many photographs in color, is that of Vonge, The Sea Shore. Other 

 zoology texts should be consulted for other opinions on phylogeny. 



