700 JOHN BEARD, 



rig. 7 A — D. The germ- cells so lettered iu text-figure C, p. 666. 

 A and C are as large as B in neighbouring section. Two sections further 

 on A is closely followed by a similar one. In this embryo there are 

 many others equally good in the same slide and even in the same 

 row of sections. Embryo 7 mm, 80 somites. 687/2, 1 r. 32 t. 



Fig. 8. A large normally placed germ-cell from the same embryo. 

 687/2, 5 r. 10 t. 



Fig. 9. A germ-cell lying beneath the splanchnopleure not far 

 from the gut, and evidently in movement. 8.5 mm. 685/2, 8 r. 9 t. 



Fig. 10. An amoeboid sub-peritoneal germ-cell with duplicated 

 nucleus. In the preparation many similar ones are near it. 10 mm. 

 410/4, 3 r. 21 b. 



rig. 11. Three sub-peritoneal germ-cells in amoeboid movement. 

 410/4, 3 r. 



Fig. 12. Two germ-cells from the germinal nidus of an embryo 



of 42 mm, to show their size and amount of yolk. 642/11, 7 r. 5 t. 



Fig. 13. A germ- cell encapsuled in the epiblast of the side- wall 

 of the posterior gill-region. 410/2, 2 r. 10 t. 



Fig. 14. A germ-cell in the connective tissue of the root of the 

 mesentery in an embryo of 42 mm. 642/9. 2 r. 5 t. 



Fig. 15, Another germ-cell from the same embryo. This one lay 

 in the epithelium of the body-cavity at the level of the spiral valve. 

 642/9. 2 r. 10 t. 



Fig. 16. A germ-cell projecting into the coelom from the under- 

 side of the subintestinal vein. The latter was still double. 410/4, 

 2 r. 5 t. 



Fig. 17. The mid-section of three through a germ-cell lying free 

 in the body-cavity. 19 mm. 677/3, 3 r. 20 t. 



Fig. 18. A large germ-cell lying between epiblast and mesoblast 

 of the ventral portion of the pericardium. The position of the nucleus 

 was clear, but not its characters. The figure shows the third of five 

 sections. 10 mm. 414/7, 1 r. 3 b. 



Fig. 19. A germ-cell projecting into the coelom from the extreme 

 ventral aspect of the somatopleure. 410/4, 2 r. 9 t. 



Fig. 20. A germ-cell in the coelom applied to but not in the 

 germinal nidus. 32 mm. 454/10, 3 r. 15 t. 



Fig. 21. Two germ-cells on the splanchnopleure near one of the 

 subintestinal veins, s.i.v. 9 mm. 684/3, 3 r. 15 b. 



Fig. 22. An amoeboid germ-cell found in three consecutive sec- 

 tions, lying under the epiblast and just beneath the segmental duct. 

 10.5 mm. 419/4, 4 r. 14 t. 



Fig. 23. A germ-cell almost at the extreme ventral aspect of the 

 peritoneum. 



The latter forms two pouches here, which are not yet fused across 

 the middle line. 6.5 mm. 393/3, 3 r. 11 t. 



