PHOTORECEPTORS IN THE AMPHIBIAN FRONTAL ORGAN

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Abstract
The fine structure of processes extending into the lumen of the frontal organ of young tadpoles of the Pacific treefrog, Hyla regilla, is described and illustrated with electron micrographs. The processes are similar to rods and cones of the vertebrate lateral eye. Larvae without frontal organ and eyes give on the average a weaker blanching reaction (concentration of pigment in the dermal melanophores of the body) when the tadpoles are placed in the dark than do the controls without eyes. It is concluded that the cells which bear the processes are photoreceptors.