EXPERIMENTAL FISH EMBRYOLOGY 



381 





O 



> 

 a 

 m 



o o 



Pblyboecitui macuLtlus 



"■V 



V 



ill 



it 



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 morpliolo^ical a^es for eacli theoretical a^e 

 group. (See detailed desnription in text.) 



RROI(BEK;KI>HALDIt 



USEHCtPHALON 



tw)aiw;tpnALOii 



PERICARDIAL 

 SOtUTOPLEUni 



TOLK SAC 



- miCARDIAL 

 SPLANCmOPLCUTU 



SmS VSMQSDS 



KXTM-IOIITOnC 



SPLAKtaOPLBU 



23. 



Diagrammatic sagittal section of Funriulus embryo before 

 development of pericardial sac. 



Diagrammatic sagittal section of Fundulus emoryo at maximum 

 development of pericardial sac. 



Diagrammatic sagittal section of PlatjTioecilus embryo at 

 beginning of formation of extra-embryonic pericardium. 



Diagrammatic sagittal section of Platypoecilus embryo at 

 maximum development of the pericardial amnion and peri- 

 cardial serosa. 



