Page:Popular Science Monthly Volume 68.djvu/494

490 In the same fashion, gray squirrels and black squirrels belong to the same species. In the same species of globe fish, Tetraodon nigropunctatus, some individuals are gray, and some citron yellow. In another species, Tetraodon setosus, some are gray, some yellow and some deep blue.

In a West Indian species of bass-like fish, strangely misnamed. Hypoplectrus unicolor, an extraordinary polychromatism occurs. All the known individuals belonging to one or another of the following color forms which have been called species: