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.
Massachusetts
TWO TEXT FIGURES AXD T W O PLATES (FOURTEEN FIGUKES)
AUTHORS' ARSTRACTThe teleost fish Brachydaiiio rerio is strikingly marked with longitudinal black stripes, which extend into the caudal fin and across the anal fin. Removal of the anal fin is followcd by complete regeneration of the fin and of its normal color pattern. Microphotographic studies show that nielanopliores are nt, first uniformly distributed in the regenerating tissue and that later the melunophores disintegrate in the zone of the future light stripe and increase in the region of the future dark stripe. Observations on the normal development of the fin where t.he history of the individual melanophoras has been followed show the same mode of formation of the stripes.
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