PLATE ; 



EXPLANATION' OF FIGURES 



1 Oogonial cell showing plasmosome and resting condition of chromatin. 

 (X 4050) 



2 Side view of metaphase spindle of oogonial division. (X 40r)0) 



3 Side view of anajiha-se spindle of oogonial division. (X 4050) 



4 Telophase of last oogonial division, showing I he p('rii)horal ])Osition of the 

 chromatin. (X 4050) 



5 Resolution Of discrete chromosomes from the peripheral chromatic mass in 

 the telophase of tlie last oogonial division. The plasmosome is also shown. 

 (X 4050) 



Peiiphcral (list riixit ion of chromosomes in early prophase of the first oocytf^- 

 (X 4050) 



7 Cell showing attachment to ihachis during giowth period. Chromosomes 

 showing Qutnkerhe. ("hromosomes jjcripheral, i)hism()som(' central in cell. 

 (X 3200) 



8 Eaily jjropiiase of first oocyte, showing formation of spireme .iml the break- 

 ing down of the chromosomes. (X 3200) 



9 Early i)rophase of first oocyte, showing loose skein witJi clironititic- giaii- 

 ules at the nodes of the linin network. (X 3200) 



10 Early prophase of first oocyte, showing condensation of network into 

 thick, jagged strands; plasmosome distinct from network. (X 3200) 



11 Cross-section of oviduct, showing arrangement of oocytes around I lie 

 rhachis. (X 550) 



'12 Early prophase of first oocyte, showing chromatin gathering toward one 

 side of the nucleus and becoming slightly vacuolated. (X 3200) 



13 Early prophase of first oocyte, showing still further condensation of the 

 chromatin into one nuiss. Vacuoles very api)arent. (3200) 



586 



