PLATE VII. 

 Fig. 75 A.- — Somewhat oblique lougitudiual section of posterior portion of 

 abdomen, ca. 97 hours, x 360. 



Fig. 75 B. — Similar section of head region and caudal lobe of the same 

 embrj'o. X 142. 



Figs. 76 A-C- — Cross sections of embryo of ca. 97 hours ; A, through head 

 lobe anterior to rostrum ; B, through stomodaeum ; C, through chelicera. 

 X 142. 



Fig. 77. — Cross secction of abdomen in plane of the fifth segment, ca. 97 

 hours. X 360. 



Fig. 78. — Postero-ventral surface view, ca. 108 hours. X 60. 



Fig. 79. — Antero-ventral surface view, ca. 108 hours, x 60. 



Figs. 80 A-E.^ — Oblique longitudinal sections of an embrj'o of ca. 108 

 hours ; A, through cheliceron and postero-lateral vesicle. X 300. B, through 

 stomodaeum. x 142. C, through antero-lateral vesicle. X 142. D, through 

 fovea and lateral wall of stomodaeum. X 142. E, through posterior end 

 of abdomen. X 360. 



