( 467 ) 



TABLE XI. 



Systematic Survey showing the derivation of the germ-layers of the Amphioxur 



from the parent-cell (cytula), and of the main organs from the germ-layeig. 



(Tree showing the ontogenetic descent of the cells in the Amphioxus). 125 



Skin-sensory Skin-fibrous 



layer layer 



imina neurodermalis) (/ximina inofei malts') 



(Fig. 157, tin) (Fig. 157, hf) 



a (Fig. 155, e) 

 (Skiu-layer, or outer germ-layer; 



Intestinal-fibrous Intestinal-g]an- 



layer dular layer 



(Lamina inogastralis) (lM.minamyxogaslralii\ 

 (Fig. 157, dj ) (Fig. 157, dd) 



"Fnto-erma (Fig- iss, t) 

 (Intestinal liyer, or inner germ-layer; 



Giatrula TFi- 22 /, K ' 

 (Cup-germ) [_Fig. 155 > P- 444 J 



stul 



(Bladder-germ) 



ig. 22, F, G) 



Mo-ula (Fig. 22, J?) 

 (MuD)erry-germ) 



Cy f u1a (Fig. 22, fl) 

 (Parent-cell) 



Mo^erula (Fig. iffl, 4) 

 (P/ireE 



Bnt-cytud') 



