No. 2.] THE OVARIAN EGG OF LIMULUS. 2OI 



or fibrillae (PI. XV, Fig. 69). On the appearance of these gran- 

 ttles, vacuoles arise; and the microsomes expand into the cytore- 

 ticulmn (PI. XIV, P^igs. 46, 53 ; PI. XV, Figs. 72, 86). The 

 formation of vacuoles and the resulting expansion may continue 

 until the entire vitelline-body is reduced to a network (Fig. 32), 

 and may seem to have entirely disappeared. The disappear- 

 ance, however, is manifestly an illusion (PI. XIV, Figs. 50, 51, 



54. 55)- 



It would seem that the attraction sphere, centrosome, and 



vitelline-body are the primitive basis or center of growth of 



the cytoplasm. 



The growth of the cytoplasm is greatest in the direction in 

 which the blue granules are most abundant. 



When the blue granules are unequally distributed around 

 the central body, growth takes place unequally, leaving the 

 body close to the germinal vesicle, or widely removed from it. 



When the blue granules are equally distributed around the 

 central body, growth takes place equally in all directions, and 

 the body becomes the center of the cytoplasm. 



