EXPLANATION OF PLATES 



Plate I 



Adults of both species of Fundulus used in the experiments. Drawings were made from life by 

 Miss Ella Weeks of the State Agricultural College of Kansas, and were first published by the writer in a 

 paper, entitled "Spawning Behavior and Sexual Dimorphism in Fundulus heteroclitus and Allier 

 Fish," which appeared in the Biological Bulletin, vol. xii, no. 5, and was kindly loaned by the editod 

 for the present use. 



The figures are life sized representations of average adults as they appear during the spawning season. 

 The pronounced sexual dimorphism is well shown. The larger size of F. majalis should also be notde. 



Fig. I. Adult female F. heteroclitus. 



Fig. 2. Adults male F. heteroclitus. 



Fig. 3. Adult female F. majalis. 



Fig. 4. Adult male F. majalis. 



