( 4^5 ) 



TABLE IX. 



Systematic Survey of the most important homologies between the human 

 embryo, the embryo of the Ascidian, and developed Amphioxus on the 

 one hand, and on the other hand, the developed Man. 



Mrnbryo of 

 Atcidian. 



Developed 



Amphio-xus. 



Human 

 Embryo. 



Developed 

 Man. 



L — Products of the Differentiation of the Shin-layer, 



IL— Products of the Differentiation of the Intestinal layers. 



Simple body cavity 



(Coeloma) 

 One-ehambered 



heart 

 Dorsal vessel 

 Simple liver pouch 



(?) 



Simple intestinal 



tube with fill- 

 openinflB 



Simple body cavity 



(Coeloma) 

 Simple tubular 



heart 

 Aorta 

 Simple liver ponch 



Simple intestinal 

 tube with gill- 

 openingf 



Simple body cavity 



(Coeloma) 

 One-chambered 



heart 

 Aorta 

 Simple liver ponch 



Simple intestinal 

 tube with gill- 

 openings 



Distinct chest and 

 ventral cavities 



Four- chambered 

 heart 



Aorta 



Large differs** 

 tiated liver 



Differentiated a» 

 testinal tube 

 without gill- 



