G. C. Davenport. — Primitive Streak, 



PLATE VII. 

 All figures magnified 73 diameters. 



Fig. 32. Sagittal section through embryo shown in Fig. 7, Plate 11. The 



notochordal canal is open below for the greater portion of its 



extent. 

 A dagger marks the supposed anterior end of the notochordal canal. 

 Fig- 33- Section lateral to, and parallel with, that of Fig. 32. The notochordal 



canal is opening at the point marked by an asterisk. 

 Fig. 34- Section lateral to, and parallel with, that shown in Fig. 33. This 



section passes near the lateral margin of the notochordal canal. 



