PLATE VI 



Fig. i. Dactyliosolen antarcticus Castracane; type phase, girdle view. 

 Figs. 2, 3. Dactyliosolen antarcticus Castracane; " laevis" phase, girdle 



view. 



Figs. 4, 5, 6. Dactyliosolen mediterraneus Peragallo; girdle view. 



Fig. 7. Chaetoceros coarctatum Lauder, parasitized by Vorticella oceanica 



Zach. Cells in chain formation, girdle view, showing protoplasmic 



contents. 

 Fig. 8. Chaetoceros coarctatum Lauder; cell in valve view. 

 Fig. 9. Chaetoceros dichaeta Ehrenberg; cells in chain formation, girdle 



view. 



Fig. 10. Chaetoceros dichaeta Ehrenberg; cell in valve view. 



