.S26 



WM. A. KEPNER AND J. B. LOOPER. 



the primary oocyte. The feeding of the oogonium, of the final 

 oogonial generation, upon the neighboring, enlarged interstitial 

 cells represents the first phase of the nutrition of the ovum of 

 Hydra viridis. Nutrition, in this phase, is referred to the growth 

 of the final oogonium into the primary oocyte. 





H fc 



v - Vi V- i .? 



HO M 



t\ 





A .- ' . <: --v^< 

 !* :f\. Ai/!V 1 



''-' 



FIG. i. Oogonium before pseudopodia are thrown off. a shows plane through 

 which section, shown in figure i of plate, was taken. 



FIG. 2. Oocyte with maximum number of pseudopodia. b shows plane through 



which section, shown in figure 5 of plate, was taken. 

 FIG. 3. Advanced primary oocyte with a full complement of deutoplasm. 



Previous investigators have failed to recognize that there are 

 two phases in the nutrition of Hydra's ovum. Perhaps failure, on 

 their part, to recognize the dual nature of the nutrition of the 

 ovum of Hydra arises out of the resemblance of the disintegrating 

 interstitial nuclei to deutoplasmic granules (Fig. 3). Brauer (91) 

 held that the nuclei of the cells, that were being ingested by the 

 egg, became the yolk granules or his " Pseudozellen." Downing 

 (08) says the "interstitial cells adjacent to the egg in the fairly 

 mature ovary have their walls in contact with the egg resorbed 

 and the content of the cell becomes part of the egg (Nusbaum). 



