The germ-cells. 701 



Fig. 24. A wandei'ing germ-cell between splanchnopleure and gut 

 just posterior to the pronephros. 393/2. Last row but one, 12 t. 



Fig. 25. A partially encapsuled germ-cell in the gut-epithelium 

 and projecting into the gut-cavity. 393/4, 1 r. 1 t. 



Fig. 26. A group of four germ-cells of 0.02 mm, lying between 

 splanchnopleure and gut. 393/2, last row but one, 1 t. 



Fig. 27. Two germ-cells between epiblast and mesoblast of the 

 ventral side of the pericardium. 393/2, 1 r. 16 t. 



Fig. 28. Two amoeboid germ-cells under the splanchnopleure and 

 near the future germinal nidus. 11 mm. 402/4, 2 r. 12 t. 



Plate 44. 



Fig. 29. A large amoeboid germ-cell between splanchnopleure 

 and gut. The (little) yolk in the cells of the gut-epithelium and 

 splanchnopleure is not represented. 393/2, 4 r. 10 t. 



Figs. 30 and 31. Germ- cells in the gut-epithelium of two em- 

 bryos of 19 and 21 mm. 677/3, 3 r. 20 t. and 617/3, last r. 23 b. 



Fig 32. Four primary germ-cells, of which one is in mitosis, in 

 the germinal nidus of an embryo of 22 mm. 652/4, 1 r. 18 t. 



Fig. 33. A portion of the germinal nidus and two secondary germ- 

 cells from an embryo of 54 mm. 245/18, 2 r. 5 t. 



Fig. 34. A germ-cell migrating through the splanchnopleure into 

 the body-cavity. 393/4, 1 r. 1 t. 



Fig. 35. An amoeboid germ-cell found in the gut-cavity. 393/4, 

 1 r. 13 t. 



Fig. 36. A large amoeboid germ-cell of 0.05 mm lying between 

 splanchnopleure and gut. The middle section of five is depicted, 393/2, 

 1 r. 3 t. 



Fig. 37. A section of the germinal nidus, with four primary germ- 

 cells, of an embryo of 32 mm. 454/10, 4 r. 1 t. 



Figs. 38, 39, 41-, 42, and 44 illustrate the degeneration of certain 

 germ- cells by simple atrophy with chromatolysis. For description see 

 text, section XIII. From embryo No. 454, 32 mm. 



Fig. 38, 454/10, 4 r. 7 t.; Fig. 39, 454/10, 4 r. 3 t.; Fig. 41, 

 454/12, last row, 9 t.; Fig. 42, 454/10, 4 r. 7 t.; Fig. 44, 454/13, 

 4 r. 10 t. 



Fig. 40. An abnormally small germ-cell free in the body-cavity 

 of embryo No. 454. 454/10, 4 r. last section. Probably it shows the 

 commencement of simple atrophy. 



Figs. 43, 45, 46, 47, and 48 illustrate the degeneration of free 

 coelomic germ-cells, by the formation of concentric nests (concentric 

 corpuscles). Fig. 48 is from embryo No. 419, the others are from 

 embryo No. 454. 



46* 



