106 ELEMENTARY BIOLOGY. [CHAP. x. 



9. Press out an ovary: according to its stage of develop- 

 ment there will be found in it 



a. Simply ectoderm cells with an unusual prepon- 

 derance of the smaller form. 



ft. Imbedded among cells like a, one which has 

 become larger and clearer than the rest, and 

 possesses a distinct central clear spot in it. 



y. Considerable aggregation of granular proto- 

 plasm round this cell, so as to form a body 

 consisting of a granular protoplasmic mass, in 

 which is imbedded a clear round vesicle, which 

 again contains a distinct rounded dot. 



8. The ripe ovum. Consisting of a great irregu- 

 larly branched mass of protoplasm (vitellus), 

 in which is a clear space (germinal vesicle) 

 containing another body (the germinal spot). . 



^ e. The segmented ovum: composed of a large 

 number of small cells. Its thick capsule, 

 rough on its external surface. 



