FISH FOR EXPERIMENTATION 



383 



H 

 > 



a 



■z _ 

 o o 



Plal)poftilui inuiuLitui 



ill 



it 



7 8 9 10 



THEORETICAL AGE IN DAYS 



Fig. 21. Chart showing age variations in 21 embryonic broods. Each vertical bar 

 represents an entire brood removed from a female. Dotted line connects the mean 

 morphological ages for each theoretical age group. (See detailed description in 

 text.) 



nimaocEFHAUW 



■saiHctnuuH 



mosnctnuuH 



embryo before development of 



Fig. 22. Diagrammatic sagittal section of Fundulus < 

 pericardial sac. 



Fig. 23. Diagrammatic sagittal section of Fundulus embryo at maximum develop- 

 ment of pericardial sac. 



Fig. 24. Diagrammatic sagittal section of Platypoecilus embryo at beginning of 

 formation of extra -embryonic pericardium. 



Fig. 25. Diagrammatic sagittal section of Platypoecilus embryo at maximum 

 development of the pericardial amnion and pericardial serosa. 



