TWELVE FIGCRESThis paper deals with an experimental analysis of terminal phases of the development of the color patterns in the fins of two fresh-water tropical fish. One of these fish is Brachydanio rerio, Hamilton and Buchanan, native of Ceylon and well knowii t o fish fanciers as the "zebra fish" and the other Phallichthys amates, Miller, found in Honduras and popularly known as the "merry widow." I n both cases the evidence has led to the hypothesis that tissue or cellular antagonisms play a part in the delineation of the patterns.
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