608 Gideon S. Dodds 



EXPLANATION OT FIGURES 



23. Two germ-cells from embryo 6 E with some surrounding cells of the ento- 

 blast. X 1260. 



24. Germ-cells from embryo 7 Fr. Two plasmosomes of the reduced size 

 appear within the nucleus, and another small deeply staining body, which may 

 possibly be a fragment of plasmosome material about to be extruded. X 1260. 



25. Germ-cell from embryo 7 Fr. Shows a stage in plasmosome reduction. 

 The nucleus contains one unreduced plasmosome, and one of reduced size. 

 Opposite this one, in the cytoplasm is a mass recently separated from it. X 1260, 



26. Germ-cell from embryo 7 Fr. A cell which has just completed plasmo- 

 some reduction. The nucleus contains two small plasmosomes. One is clearly 

 in contact with the nuclear membrane and just opposite it a mass just separated 

 from it. X 1260. 



27. Two germ-cells from embryo 7 Fr. These have both completed plasmo- 

 some reduction. In one of them the extruded plasmosome has separated into 

 two parts. X 1260. 



28. Four germ-cells from embryo 8 E. All of these lie in the solid lateral plate. 

 Two of them show the extruded plasmosome in the cytoplasm of the cell. X 1260. 



29. A single germ-cell from embryo 9 A, lying in the splanchnic mesoblast. In 

 this and in older embryos, the pigment cells are a conspicuous feature. X 1260. 



30. Two germ-cells from embryo 10 D, migrating from splanchnic to somatic 

 layers of mesoblast. X 1260. 



