ENLARGED PERICARDIUM IN LEBISTES EMBRYO 201 



FlG. 8 



Formation of amnion in mammals (A, B) comparée! with 

 ectodermal and pericardial headfolds in Lebistes reticulatus (C) 

 A = Pleuramnion 1 in mammals (after Portmann, J965) 

 B = Schizamnion J 



C = " Pleuramnion " in Lebistes reticulatus 

 1 embryo primordium 2) trophoblast/extraembryonic ectoderm 3) entoderm/yolk sac entoderm 

 eriblast) 4) amniotic folds 5) amniotic crevasse 6) amnion 7) extraembryonic coelom 7') extra- 



embryonic pericardium 



