EXPLANATION OF PLATE 63. 



Embryology of Euvanessa antiopa. 



Lithographed ia three colors by B. Meisel. All the figures are ilrawu with a camera lucida by 0. W. Wood- 

 worth from sections al>out .00025 iuch thicli. Figures 1, 2, 5, 7 and 8 werejmade with a oue-fifth, the others with a 

 three-fourths objective. • 



1. Section of a small piece of the ovariole of 

 a freshly emerged butterfly, showing two egg- 

 chambers ; p, peritoneal membrane ; t.p, tunica 

 propria; ep, epithelial cell ; n, their nuclei; e, egg- 

 cell; fjf, germinal vesicle, the nucleus of the egg 

 cell. 



2. Section of a single egg chamber considerably 

 further advauced. Lettering the same as in Fig. 1. 

 n. p, nutritive process. 



3. An oblique section of an egg. showing the 

 migration of the blastoderm cells. 



4. A section near one end, showing the process 

 of blastoderm formation. 



5. Yolk cells, when all but the last row of yolk 

 granules have degenerated. 



6. Section of an egg after the completion of 

 blastoderm formation. 



7. Portion of ventral plate, with mesoderm (?) 

 cells. 



8. Portion of ventral plate, showing ovary cells. 



9. Cross section of egg at about the time of the 

 beginning of the formation of the amnion. 



10. Longitudinal section of the same. 



11. Section of the egg after the completion of 

 the embryonic membranes; am, amnion; s. m, 

 serous membrane. 



