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THE AMERICAN NATURALIST [Vol. XLI 



She frequently pushed her way through the clump of weed but more 

 often passed around it, the silken tenacious cord binding it together 

 in a globular or oval mass about the size of a hen's egg. The 

 entire nest shown in the photograph was formed in about two hours, 

 the fish dropping to the bottom of the tank after each effort and lying 

 there for ten or twenty minutes. 



The accompanying photograph of probably the first nest of 

 Heterostichus to be recorded was made under my direction by 



