SI 
On 
HEREDITY OF PIGMENTATION ] 
18 19 
Fig. 15 Pure F. heteroclitus, twelve days old. Fully developed red chroma- 
tophore near the eye of embryo. Dotted lines indicate blood vessels. > 75. 
Fig. 16 F. heteroclitus egg hybrid, twelve days old. Fully developed red yolk- 
chromatophore in center of clear space in black chromatophore reticulum. X 75. 
Fig. 17 Pure F. majalis, thirteen days old. Characteristic red yolk chroma- 
tophore on blood vessel. > 75. 
Fig. 18 Pure F. heteroclitus, six days old. Group of chromatophores begin- 
ning to form chromatophore reticulum on blood vessels near left eye. > 114. 
Fig. 19 F. heteroclitus egg hybrid, six days old. Same series and same age as 
embryo of fig. 18. Group of chromatophores on blood vessel near left eye. 114. 
