PLATE 5 



EXPLANATION OF FIGURES 



30 to 38 Represent approximately the form and color of the red yolk chroma- 

 tophores in pure and hybrid strains. 



30 Red-brown cell of pure F. diaphanus, showing profuse branching. 



31 Brick red cell of pure F. heteroclitus, showing large size and many branches. 



32 Brick red, but very small inconspicuous cell of F. majalis, showing hair- 

 like branches. 



33 Type of red chromatophore found in hybrid larvae from F. diaphanus egg 

 and F. heteroclitus sperm. These cells are less branched than in F. diaphanus 

 and are intermediate in color between red-brown and brick red. 



34 Type of red yolk chromatophore found in hybrids from F. diaphanus sperm 

 and F. heteroclitus egg. Branches are shorter than in reciprocal cross; color same 

 as reciprocal cross. 



35 Type of red chromatophore in hybrids from F. diaphanus egg and F. 

 majalis sperm. Strictly intermediate in every particular. 



36 Type of red chromatophore in hybrids from F. majalis egg and F. diaph- 

 anus sperm. Like reciprocal cross except that cells are more branched. 



37 and 38 Types of red chromatophore in the two reciprocal crosses between 

 F. heteroclitus and F. majalis. Fig. 37 the F. heteroclitus egg hybrid, figure 

 38 F. majalis egg hybrid. In both cases the intermediate condition is evident. 



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