PLATE VI. 

 Fig. 67 A. — Somewhat oblique longitudinal section of cephalic region, ca. 

 861/2 hours. X 360. 



Fig. 67 B. — Longitudinal section of the same embryo through the lateral 

 edge of the stomodaeum. X 360. 



Fig. 67 C- — Longitudinal section through extraembi*yonic blood-forming 

 area of the same stage. X 720. 



Figs. 68 A-C. — Transverse sections of cephalic lobe of embryo of 86% hours ; 

 A; through rostral extremities ; B, through stomodaeum ; C, through antero- 

 lateral vesicle in the same plane as Fig. A. x 360. 



Fig. 68 D.^ — Transverse section of the same embryo, the rostral appendages 

 above, a pair of thoracal legs below. X 142. 



Fig. 68 E. — Portion of left half of preceding drawing, on higher scale. 

 X 360. 



Fig. 68. F. — Cross section of same embryo, cephalic lobe anterior to the 

 rostrum. X 142, 



Fig. 68 G. — Cross section of the same embryo, lateral margin of head 

 lobe and blood-forming region of extraembryonic area, x 720. 



Fig. 69. — Longitudinal section through abdomen, 86% hours. X 360. 



Fig. 70. — Longitudinal section of the fourth leg and first abdominal seg- 

 ment, 86% hours. X 360. 



Fig. 71. — Oblique antero-lateral surface view, ca. 97 hours, x ^■ 



Fig. 72. — Anterior surface view, ca. 97 hours, x 60. 



Fig. 73. — Lat'ero-posterior surface view, ca. 97 hours. X 60. 



Fig. 74. — Ventro-posterior surface view, ca. 97 hours, x 60. 



