26 JOHNS HOPKINS UNIVERSITY MORPHOLOGICAL MONOGRAPHS. 



central cells and showing here and there a nettle cell just as the repro- 

 ductive organ does. The epithelial cells differ from those of the ovary in 

 containing one or more large vacuoles, and this vacuolation increases as 

 the embryos, among which the masses float, develop. The idea naturally 

 suggests itself, therefore, that they serve for nourishing and perhaps for 

 protecting the embryos while they are developing in the stomach pockets 

 of the mother individual. 



