Abstract
In the epidermis of frogs (Rana clamitans, R. sylvatica, R. catesbeiana, R. pipiens, and 1 species of Hyla) and frog tadpoles are greatly elongated melanophores that are very different in general shape from those in the dermis. Epidermal melanophores up to 246 [mu] in length have been found in frog tadpoles. Anastomosing of epidermal melanophores is common. "Expansion" and "contraction" are accomplished by the migration of pigment granules into and out of permanent processes.

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