\ graphic transparent reconstruction of the tnbryo \'I except the 



nephrogenic system and mesodermic somites which are shown in text figure 3. 



irterial system is coloured red, venous system blue, alimentary system 

 violet, notochord green, central nervous system light yellow, all ganglia and the 

 ■ ange yellow. 



HOEN 4 CO. Iith 



