SEGMENTED SCHIZOCOELS 



253 



Cloudsley- Thompson, J. L., 1958. Spiders, Scorpions, Centi- 

 pedes and Mites. Permagon Press, New York. 



Gertsch, W. J., 1949. American Spiders. D. Van Nostrand 

 Co., Princeton, N.J. 



Green, J., 1961. .-i Biology of Crustacea. Quadrangle Books, 

 Chicago. 



Klotts, A. B., and E. B. Klotts, 1959. Living Insects of the 

 World. Doubleday & Co., Garden City, N. Y. 



Mann, K. H., 1962. Leeches (Hirudinea), Their Structure, 

 Physiology. Ecology and Embryology. Permagon Press, 

 New York. 



Schmitt, VV. L., 1910. Crustaceans. Smithsonian Series. 



Series Publishers, New York. 

 Vessel, M. F., and E.J. Harrington, 1961. Common .Native 



Animals. Chandler Publ. Co., San Francisco, Calif. 

 Waterman, T. H., ed., 1960. The Physiology of Crustacea. 



Vol 1: .Metabolism and Growth. Academic Press, New 



York. 

 . 1961. The Physiology of Crustacea. Vol. 2: Sense 



Organs, Integration and Behavior, Academic Press, New 



York. 



