Hargitt: Pennaria tiarella and Tub ul aria crocea. 



PLATE 3. 



Pennaria tiarella. 



Eggs of Figures 19a-19c killed in Zenker's fluid, all others in Bouin's fluid. 

 All stained in iron hematoxylin and Congo red. All except Figure 20a mag- 

 nified 1600. 



Figs. 19a-19c. Three nuclei within one egg. Figure 19a shows the egg 

 nucleus and the other Figures, the two sperm nuclei. Both 

 sperm nuclei were near the surface of the egg, and equidistant 

 from the egg nucleus. No asters or centrosomes accompanied 

 any nucleus. 



Fig. 20a. Portion of egg showing sperm track and three vesicles at the apex 

 of the track. X about 190. 



Fig. 20b. The three vesicles of Figure 20a; the middle one is perhaps the 

 egg nucleus and the other two sperm nuclei. Although over- 

 lapping is shown in the Figure, there is no contact. 



Figs. 21a, 21b. Figure 21a is a lobed sperm nucleus without aster, and 

 Figure 21b the compound egg nucleus of the same egg, with a 

 large aster. 



Fig. 22. Figure compiled from two sections; vesicles "a" from one section, 

 vesicles "b" from the preceding section. These vesicles repre- 

 sent both sperm and egg nucleus. 



Fig. 23. Germ nuclei just before contact. Chromatin in beaded strands. 

 Neither asters nor centrosome are present. 



Fig. 24. Germ nuclei of equal size, in contact. Chromatin in the form of 

 granules in the linin reticulum. Without aster or centrosome. 



