King.—C ytology of Araiospora. 
PLATE 12. 
Fig. 11-14. Oogonia showing stages in the origin of the differentiated central 
ooplasm and the formation of the peripheral vacuoles. 
Fig. 15. Oogonium showing nuclear division and the formation of the plasma 
membrane of oosphere and periplasm. 
Fig. 16. Ripe oosphere cut so as to show the receptive papilla, a portion of 
the fine meshed central ooplasm, and the coarse meshed periph¬ 
eral ooplasm, the densely filled antheridium, and the partially 
perforated intervening walls. The peripheral cells are here cut 
off. 
