214 M UN SON. 



Fig. 50. One of the smallest eggs of an old animal having many empty folli- 

 cles. Cytoreticulum and aster, ast., very distinct. Metaplasmic granules or 

 archoplasm, very scarce or absent. Method: Merkel's fluid, Biondi-Ehrlich stain. 



Fig. 51. Similar to Fig. 50 ; egg a little larger; metaplasmic granules more 

 abundant. Method same as Fig. 50. 



Fig. 52. A very distinct, sharply limited aster, ast.; g.v., germinal vesicle ; 

 ncl., nucleolus, containing a central vacuole. 



Fig. 53. Egg from adult animal, showing a blue sphere, sp/i., consisting of a 

 central body, centrosome, surrounded by radial astral rays that become lost in a 

 zone of archoplasmic granules, which again is surrounded by compacted fibers that 

 merge gradually into the cytoplasmic reticulum. 



Fig. 54. Egg showing a distinct cytoreticulum, in which there is a conspicuous 

 aster, ast. This is farther removed from the germinal vesicle, j'.z'., than the similar 

 structures seen in Figs. 50, 51. 



Fig. 55. Section of an egg showing position of aster in a plane at right angles 

 to the primary egg axis. 



Fig. 56. Section of an egg preserved in Flemming's fluid and stained in acid 

 fuchsin. A large, bright-red body, c, in the cytoplasm, whose reticulum is 

 arranged radially around the centrosome and sphere. 



Fig. 57. Section of an egg showing a central body or centrosome, and a con- 

 spicuous aster, ast. Method : corrosive acetic, haematoxylin, and acid fuchsin. 



Fig. 58. Section of an egg showing sphere, spk., with two central structures 

 surrounded by archoplasm. Method: safranin and Lyon's blue. The sphere 

 alone, deep blue ; the rest of the cytoplasm and the germinal vesicle, red. 



Fig. 59. Section of egg showing germinal vesicle,^.!'.; nucleolus, «^/.; periph- 

 eral bodies, /.i5.; and a centrosome and sphere, c, connected with a fibrous polar 

 protoplasm, or polar mitosome, /.m. 



Fig. 60. Section of an egg showing a large granular central body, c, a rone 

 of fibrous protoplasm, and a zone of granular metaplasm (archoplasm), m.pl., from 

 which radiate many cytoplasmic fibers or astral rays. 



Fig. 6i. Section of egg showing archoplasm, arch., containing many vacuoles 

 and a central granular body, the centrosphere ; g.v., germinal vesicle ; ncl., 

 nucleolus. 



Fig. 62. Section of egg showing a conspicuous sphere, sfh., containing a cen- 

 tral body, centrosome (c), and surrounded by a zone of blue granules, d.g. The 

 sphere, sph., red. At the proximal pole, the modified polar mitosome. 



Fig. 63. Section of egg showing a conspicuous vitelline-body, v.b. The 

 peripheral protoplasmic layer is seen to extend into the central granular mass, and 

 to thus divide the latter into three portions. 



