832 



A. 



THE MAMMALIAN EMBRYO, [CHAP. 



FIG. 107. 



TRANSVERSE SECTION THROUGH THE HEAD OF A KABBIT OF 

 THE SAME AGE AS FIG. 106 B. (From Kolliker.) 



B. is a more highly magnified representation of part of A. 



rf. medullary groove ; mp. medullary plate ; rw. medullary fold ; 

 h. epiblast ; dd. hypoblast ; dd'. notochordal thickening of 

 hypoblast ; sp. undivided mesoblast ; hp. somatic mesoblast ; 



