51 



Recently emptied ovarian follicle of the frog. 



similar size or weight, such as pellets of paraffin, will be carried along 

 by the ciliary currents in the original direction of the ostium. These 

 cilia function the year around, and will carry to the ostia any objects 

 of approximately the size and weight of frog eggs that may be placed 

 in the body cavity. One might suggest, therefore, that the oviducts 

 may act as accessory excretory ducts, for certainly body cavity fluids 

 must be similarly eliminated. 



As the egg leaves the ovary it is nude except for the non-living, 

 transparent, and closely applied vitelline membrane. Thus far it has 

 been impossible to fertilize these body cavity eggs and have them 

 develop. When they are placed in a sperm suspension some will show 

 surface markings which resemble very closely the normal cleavage 

 spindles and the cleavage furrows but none have developed as em- 

 bryos as yet. These body cavity eggs are often quite distorted, due to 

 the fact that the ovulation process involves a rupture of the follicle 

 and forcing out of the egg from a very muscular follicle. The egg is 



