Smallwood. — Maturation Hamiuea. 



PLATE 3. 



Fig. 13. Section of an egg parallel to axis of first maturation spindle. Tlie matu- 

 ration figure occupies the centre of the egg and is surrounded by 

 cytoplasm which is mostly free from yolk spheres. Tlie central 

 spindle lias disappeared. The chromatin in each of the chromosome 

 vesicles consists of three masses arranged in a linear series or a three- 

 lobed mass. The centrosome is a single solid body. Egg from 

 ovotestis. Iron hseinatoxylin and Bordeaux red. X 1680. 



Figs. 14, 15. Sections through the germinative vesicle perpendicular to the axis of 

 ' the forming spindle in the region of its equatorial plane. Chromo- 



some vesicles are definite in outline. The chromatin is located on 

 one side or projects out into the vesicle. Linin threads disappearing. 

 Egg taken from the ovotestis. Iron hematoxylin and Bordeaux red. 

 X 1680. 



Fig. 16. Portion of a section from an egg taken from the ovotestis. The chromo- 

 some vesicles enclosing the chromosomes have disappeared. Chro- 

 mosomes three-lobed. Centrosome differentiated into thin centroplasra 

 layer and a centriole. Iron haematoxylin and Bordeaux red. X 1080. 



Fig. 17. Section of the germinative vesicle perpendicular to the spindle axis in 

 region of equatorial plane. The chromosome vesicles are connected 

 to one another by linin threads. The cytoplasm is somewhat con- 

 densed and finely granular immediately around the germinative vesi- 

 cle. Taken from the ovotestis. Iron haematoxylin and Bordeaux 

 red. X 1680. 



Fig. 18. Portion of section of an egg, showing the primary astral rays extending to 

 the periphery of the egg. There are on them small bodies. The 

 secondary rays are much shorter and finer than the primary ones. 

 Delafield's haematoxylin and picric acid. X 1680. 



