PLATE XV. 



FIG. 125. 



FIG. 127. 







Development of Medusa buds in Syn- 

 choryna Snrsii. 



FIG 126. 



A, Portion of Cellularia ciliata, enlarged ; B, 

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

 more highly magnified, and seen in the act of 

 grasping another. 



FIG. 128. 



Successive stages of development of Medusa 

 buds from Slrobila larva. 



Sertularia cupressina : A, natural size; 

 B, portion magnified. 



