2 1 6 MUNSON. 



EXPLANATION OF PLATE XV. 



Fig. 64. Section of egg showing a conspicuous, deep-red, homogeneous vitel- 

 line-body or sphere, containing central granular bodies or centrioles. 



Fig. 65. A deep-red vitelline-body, whose fibers are arranged with reference 

 to two poles, at one of which there is a sphere with archoplasm and radial fibers. 

 Method : Merkel's fluid, eosin. 



Fig. 66. Section of egg showing peripheral bodies, a germinal vesicle with 

 nucleolus ; in the cytoplasm, archoplasmic sphere containing two large spherical 

 central bodies. 



Fig. 67. Section of egg showing peripheral bodies, a conspicuous red centro- 

 some, surrounded by a clear zone, which again is surrounded by a zone of blue 

 granules, and this again surrounded by archoplasm. Radial fibers proceeding from 

 this can be traced throughout the entire cytoplasm. Method : Merkel's fluid, 

 Ehrlich's haemato.xylin and eosin. 



Fig. 68. Section of egg showing germinal vesicle, containing a nucleolus, in 

 which is seen a central spherical body, the endonucleolus. In the cytoplasm is a 

 conspicuous deep-red centrosome, surrounded by a zone of blue granules, and 

 this again by a system of red astral rays extending to the periphery of the egg. 

 Method : Merkel's fluid, Ehrlich's haematoxylin, and acid fuchsin. 



Fig. 69. Section of egg preserved in Hermann's fluid, showing a conspicuous 

 homogeneous vitelline-body with indications of astral rays proceeding from it. 

 Method: Hermann's fluid, acid fuchsin. 



Fig. 70. Section of egg showing germinal vesicle and nucleolus ; and in the 

 cytoplasm a conspicuous vitelline-body containing granular vacuoles, a system 

 of astral rays, and numerous blue granules. Method : Merkel's fluid, Ehrlich's 

 haematoxylin, and acid fuchsin. 



Fig. 71. Section of egg showing germinal vesicle containing a large " Haupt- 

 nucleolus " and small " Nebennucleolus." Close to the germinal vesicle, a 

 sharply defined sphere with indistinct granular rays, and a large granular central 

 body. Method : Merkel's fluid, eosin. 



Fig. 72. Section of egg with germinal vesicle containing nucleolus ; in the 

 cytoplasm a deeply staining sphere containing numerous granular vacuoles. 



Fig. 73. Section of egg with germinal vesicle, nucleolus, a prominent vitelline- 

 body or sphere, consisting of a sharply defined granular body, partly surrounded 

 by a zone of fibrous archoplasm. Method : Merkel's fluid, haematoxylin, and 

 eosin. 



Fig. 74. Section of egg with germinal vesicle, a " Hauptnucleolus," and a 

 " Nebennucleolus." In the cytoplasm a conspicuous sphere with a central lighter 

 granular body, surrounded by a broad zone of deeply staining archoplasm. 

 Method : Kleinenberg's picro-sulphuric, haematoxylin, and acid fuchsin. 



Fig. 75. Section sho%ving the same as above. The sphere, deep blue, shows 

 central body, centrosome, and a somewhat regular arrangement of radial fibers to 

 a peripheral concentric protoplasmic zone. Method : Merkel's fluid, safranin, and 

 Lyon's blue. 



Fig. 76. Section with germinal vesicle, nucleolus ; in the cytoplasm a vitelUne- 

 body, consisting of a central granular body which is partly surrounded by a horse- 

 shoe-shaped archoplasmic zone. In the outer portion of this red archoplasm are 



