HEREDITY OF PIGMENTATION Mee 
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27 
Fig. 25 Pure F. majalis, thirty-five days old, just hatched. Shows the line 
of chromatophores along the dorsal surface of the nerve cord, N...N, which were 
expanded; and the contracted chromatophores of the lateralline, L...L. A...A= 
Aorta, V...V=Ventral vein. Neither the chromatophores on these last two ves- 
sels nor on the dorsal surface of the fish have been drawn in. 25, 
Fig. 26 F. heteroclitus egg hybrid, sixteen days old, just hatched. S...S line 
of chromatophores under dorsal skin, partly contracted by the narcotization. 
N...N chromatophores on nerve core, partly contracted; L...L lateral line. All 
tite red chromatophores contracted, bisick Ghiomenoonores asta: contracted at 
left where they formed a complete line when the drawing was begun. In the cen- 
ter of the lateral line the chromatophores are expanded; and on the right some of 
them are completely contracted on account of another dose of narcotic. A...A 
=Aorta V...V=Ventral vein. Chrcematophores on these last two vessels 
drawn in from another uncontracted fish. 25. 
Fig. 27 Pure F. heteroclitus, just hatched. Shows red opaque chromatophores 
of the lateral line. X 127. 
