{Contintied from 'preceding page) 



Fig. 33. Sagittal section through an egg similar to that shown in Fig. 32 

 (Stage F). The relations of pole-cells, pole-cell canal and pseudoblastodermic 

 nuclei are here well illustrated, a, invagination which will give rise to 

 stomodeum. x 60. 



Fig. 34. Transverse section through posterior depression in ventral groove, 

 Fig. 32 (Stage F). a, flask-shaped depression in ventral groove, x 105. 



Fig. 35. Transverse section near the end of the tail-fold of an embryo of 

 Leptinotarsa similar to Stage H, position 35. The pole-cells are creeping from 

 the posterior amniotic cavity through the pole-cell canal, x 140. 



Fig. 36. Sagittal section through the posterior end of an egg of Leptinotarsa 

 like Stage H, position 36. One pole-cell is part way through the pole-cell 

 canal, x 105. 



Fig. 37. Sagittal section through the tail-fold of an embryo in Stage J, 

 position 37. Mesoderm has appeared. A few pseudoblastodermic nuclei show 

 signs of disintegration, x 105. 



Fig. 38. Transverse section of tail-fold of embryo in Stage J, (38), showing 

 passage of pole-cells through pole-cell canal, a, flask-shaped depression in 

 ventral groove, x 105. 



