SPAWNING BEHAVIOR IN FUNDULUS HETEROCLITUS. 327 



3 



TEXT PLATE II. 



Showing the distribution of contact organs in males of the four species. The 

 stippled areas represent regions supplied with contact organs. Where the stippling 

 is heaviest the contact organs are most numerous and best developed. The dots on 

 the fins represent contact organs. 



1. Fundulns heteroclilus. 



2. F. in a /a Us. 



3. F. diaphanus. 



4. Cyprinodon variegatus. 



