PLATE 2 



EXPLANATION OF FIGURE* 



3 A subnormal hybrid embrj-o (Fundulus 9 Scomber cf ), two weeks old, show- 

 ing abnormal eyes and a rather pronounced ascendency of the paternal types of. 

 chromatophores. Only a few of the red chromatophores of Fundulus occur, while 

 the green chromatophores of the Mackerel are numerous. The whole embryo 

 has a greenish cast that one never sees in a pure-bred Fundulus embryo. 



4 A sample field on the yolk-sac of a tj^pical hybrid embryo (Fundulus 9 

 Scomber cf ), two weeks old, showing all four types of chromatophores: the 

 solid squarish blacks of Fundulus (they were not particularly square in this field), 

 the finely branching blacks of Scomber, the reds of Fundulus and the greens of 

 Scomber. The field drawn was not chosen to emphasize any point, but was 

 selected by the artist with scarcely any direction. 



420 



