Plate VIII. 



Fig. 9. — Longitudiiuil section near the median line of an embryo of tlie same lot 

 and stage as that represented in Figs. 1 & la. CCx2 (Bib, 41. 2c. last-2) 



Fig. 10. — Part of a longitudinal section of the same series as Fig. 9. From more 

 lateral parts. DD x 4 (Bib, long. 2, 51., last-2) 



Fig. 11 a k h. — Two merocytes from the same series as Fig. 9. DDx5 



fvi\U f :T" l"»g- 2, 51. last— 2\ 

 (.I^l'^lh. long. 2.51. 7.S ; 



Fig. 12 a k h. — Cells of the same kind as those represented in the middle stratum 



of Fig. 10. DDX4 (Bib.l-S-^^.-^-^) 



Fig. 13. — Longitudinal section near the median line of the embryo represented in 



Figs. 2 & 2a. C0X2 (D la, 31. 2c. 5s.) 



Fig. 14. — Longitudinal section near the median line of the embryo represented in 



Figs. 3 & 3a. CCx2 (C2. long, i, il. 2c. 7s.) 



Fig. 15.— Longitudinal section near the median line of an embryo 1 day older than 



Figs. 1 k la and 1 day younger than Fig. 4 k 4a. CCX2 (B3. loug. 1. 41. last) 

 Fig. 10. — Longitudinal section near the median line of the embryo represented in 



Fig. 8 his. and da. his. CCx2 (O? long. 1. 21. 2c. 2s.) 



Fi(i. 17.— Longitudinal section near the median line of an embryo slightly younger 



than Figs. G & 6«. CCx2 (B6. 31. lOs.) 



Fig. 18. — Longitudinal section near the median line of the embryo represented in 



Figs. 7 and 76. BBx2 (B7b. 31. 2c. is.) 



