ORIGIN OF BLOOD AND ENDOTHELIUM 



25 



PC 



14 



Fig. 10 An eight-day embryo of Fundulus majalis from 2 cc. alcohol solution, 

 showing a condition similar to the heteroclitus embryos; Ce, cyclopean eye; 

 PC, distended pericardium; ht, straight heart and no circulation. 



Fig. 11 A normal majalis embryo of eight days with S-shaped heart, ht, 

 and yolk vessels forming a net. Same magnification as the smaller heteroclitus 

 embryos. 



Fig. 12 A ten-day heteroclitus embryo, no blood circulation, chromatophores 

 expanded and accumulated on posterior yolk region; ht, heart; PC, distended 

 pericardium; CV, cardinal vein filled with erythroblasts; SV, stem vein also full 

 of red blood corpuscles. 



Fig. 13 Embryo ten days old; ht, the heart a mere string covered with pig- 

 ment; I, an independent crystalline lens; other lettering as in figure 12. 



Fig. 14 View of head of ten-day embryo, no circulation, distended pericard- 

 dium, PC; I, free lens. 



