Joliii p. Muiison 343 



Fig. 35. Egg showing the cytocenter with a clear open space part way 

 around it, the cytoccel, with some indications of radial striations in the 

 cytoplasm of the peripheral zone. 



Fig. 36. Egg showing a cytocenter with a centrosome, and a yolk-nucleus 

 in its immediate neighborhood, and several at the periphery. 



Fig. 37. Section of an egg showing an aster-like cytocenter, with a larger 

 yolk-nucleus between it and the germinal vesicle and two opposite, not very 

 distinct in the plate. 



Fig. 38. Section of an egg. showing the cytoreticulum very distinctly and 

 a cytocenter composed of circles of microsomes, in the midst of which are 

 several yolk-nuclei. 



Fig. 39. Section showing cytocenter with central granules; its relation to 

 the germinal vesicle; yolk-nuclei at the periphery, and one near the center. 



FiQ. 40. Section of an egg showing cytocenter in form of a sphere, with 

 clear central globule, circle of microsomes, and astral radiations; also many 

 concentric zones in the cytoplasm. 



Fig. 41. Section of an egg, showing the chromatin network in the germ- 

 inal vesicle, numerous nucleoli, and a homogeneous cytocenter having the 

 appearance of archoplasm. 



Fig. 42. Section of an egg, showing cytoreticulum, a cytocenter with radial 

 striations apparently continuous with the cytoreticulum, and bounded by a 

 circle of large microsomes, the cytocoel; in the peripheral zone a large yolk- 

 nucleus. 



Fig. 43. Section of an egg with a cytocenter in which the central granules 

 are most marked; a clearer zone surrounding it in which the granules of 

 the cytoplasm are not so marked. 



Fig. 44. Section of an egg showing three large yolk-nuclei and some 

 smaller ones. The cytocenter of this egg is in another section, not here 

 represented. 



Fig. 45. Section showing a large cytocenter apparently homogeneous and 

 feebly stained. It resembles archoplasm. 



Fig. 46. Section of an egg, showing cytocenter with an unstained central 

 globule, surrounded by archoplasm, and this again surrounded by an outer 

 irregular ring of archoplasm shading imperceptibly into the general cyto- 

 plasm; in the germinal vesicle, nucleoli and chromatin network in the 

 midst of a granular caryolymph or ground-substance. 



Fig. 47. Section of an egg, showing cytocenter consisting of a central, 

 granular spherical body, surrounded by a ring of similar substance, a lighter 

 ring separating them; a similar ring bounding the outer circle from which 

 radial striations are evident on two sides, a small yolk-nucleus close to the 

 germinal vesicle. 



Fig. 48. Section of an egg showing a homogeneous cytocenter with slightly 

 darker central portion; in the germinal vesicle a headed nuclear reticulum. 



Fig. 49. A section showing a cytocenter with a somewhat indistinct central 

 portion and an outer zone of reticulated fibrils. 



Fro. 50. Section of an egg of the tortoise showing germinal vesicle with 

 peripheral nucleoli, chromatin bodies and a typical cytocenter resembling 

 an attraction sphere with a central centrosome, and surrounded by an indis- 

 tinct zone bearing a constant relation to the germinal vesicle. 



