PLATE III. 

 Figs. 30, A, B. — Oblique longitudinal section, of germ disc of ca. 54 hours, 

 A, through posterior cumulus (but to one side of anterior cumulus), B, lateral 

 from both cumuli. X 142. 



Fig. 31. — Cross section through middle of germ disc of egg of ca. 54 hours ; 

 vitellocytes forming from anterior cumulus and from lateral marginal germ 

 disc. X 142. 



Fig. 32. — Surface view of germ disc of ca. 54 hours, seen in alcohol. 

 X 30. 

 Fig. 33. — Similar view of germ disc of ca. 50 hours, x 30. 



Fig. 34.— Ventral surface view of egg of ca. 37 hours, the shaded area 

 marking the region of axial cell invagination ; 1222 cells on surface of the 

 germ disc. X 142. 



Fig. 35. — Cross section of posterior cumulus ca. 37 hours. X 360. 



Fig. 36. — Longitudinal section of posterior cumulus ca. 37 hours, x 360. 



Figs. 37 A. B. — Oblique cross sections of anterior cumulus of an egg of ca. 

 37 hours. X 360. 



Fig. 38 A. — Oblique longitudinal section of germ disc through the anterior 

 cumulus, ca. 37 liours. x 142. 



Fig. 38 B. — Section of the anterior cumulus of the egg shown in the pre- 

 ceding figure, drawn to larger scale. X 360. 



Fig. 39. — Cross section of germ disc at anterior edge of anterior cumulus, 

 ca. 37 hours. X 142. 



Figs. 40 A, B. — Ventral surface views of a germ disc of ca. 49 hours ; 

 A, shows the nuclei of the superficial cells (1441 in number) ; and B, the 

 nuclei of the larger cells (69 in number) that have sunk below the 

 former and spread out upon the surface of the yolk. X 142. 



Fig. 41 A. — Exact median section of an egg of ca. 49 hours. X 142. 



Figs. 41 B, C. — Two other longitudinal sections of the preceding egg, 

 both in the region of the anterior cumulus. X 360. 



