PLATE XV. 



FIG. 125. 



FIG. 127. 



Development of Medusa buds in Syn- 

 choryna Sarsii. 



FIG 126. 







LSI 



.:. .-.-'- .- 





A, Portion of Cellularia ciliata, enlarged ; B, 

 one of the " bird's-head " of Bugula aiicularia, 

 more highly magnified, and seen in the act of 

 grasping another. 



FIG. 128. 



Successive stages of development of Medusa 

 buds from Strtibila. larva. 



Sertularia cupressi>ia:A, natural size; 

 B, portion magnified. 



