PLATE XV. 



FIG. 125. 



Development of Medusa buds in Syn- 

 choryna Sarsii. 



FIG 126. 



A, Portion of Cellularia cilia/a, enlarged ; B, 

 one of the " bird's-head " of Evgula avicularia, 

 more highly magnified, and seen in the act of 

 grasping another. 



FIG. 128. 



d d 



Successive stages of development of Medusa 

 buds from Strobila larva. 



Sertularia cupresaina:A, natural size: 

 B, portion magnified. 



