Fig. 27 Photograph of a section through the diencephalon of the 19 mm. em- 

 bryo, H 173. X 16f. Slide 21, Sect. 11. The break in the hemisphere wall to 

 the left is an injury to this individual section. Compare figure 1, drawn from the 

 same section. 



Fig. 28 Photograph of a section through the lateral choroid plexus of the 

 28 mm. embryo, H 91. X 20. Sect. 355. Section taken midway between figures 

 7 and 11, as shown in figure 20. 



Fig. 29 Photograph of the 19 mm. embryo, H 173. X 2. Plane of section 

 indicated. 



Fig. 30 Photograph of the 28 mm. embryo, H 91. X H- Plane of section 

 indicated. 



Fig. 31 Photograph of the 32 mm, embryo, H 41. X U- Plane of section 

 indicated. 



120 



