?iy?i ft".^::^<iN:'^"V■^.*.■i:^■-^rT^■■i<^ > 



Fis- 5 Transverse so.etioii of aii embryo of two soiuifes at the level iiuli- 

 eatcd in Figure 3. Slide 5, row I, section (j, X 3()0. Reduced J-. 



1 Ectoderm 5 Hypercntodermal mescnchj'mc 



2 Mesoderm 6 Coelom 



3 Entoderm 7 Xeural plate 

 •1 Hypcctodeniial mesenchyme 



Fig. (i Dorsal view of model of mesoderm (white), mesenchyme (green) and 

 vasofactive cells (yellow) of an endjryo of four somites. Colundjia collection No. 

 409, X 300. Reduced 1. 



1 Somite 1 



12 .\nlages of juxta-ncur;d anastomosis 

 3 Connection between the juxta-nem'al 

 anastomosis and (he .loila, cf. fig- 

 ure 25 



4 Site of quintal ganglion 



5 Endothelial anlage opposite the 



second nephrotome; cf. figures 8 

 and 



6 Region of cardiac coelom 



60 



