Text-fig. 6. 



4 ^2 mm. 



mm. 



8 nun 



10 



mm 



beries of diagrammatic reconstructions of embryos of the lengths 

 of 4-5, 5, 6, 7, 8, and 10 mm. drawn to the sanie scale. The rudi- 

 ments of the facial nerve are joined by a chain Ime, the corre- 

 spondmg somites of the different embryos by dotted lines. 



K k 2 



