PLATE V. 



Syncoryne eximia. 



Fig. 



1. A portion of a colony magnified, the hydranth to the left, loaded with planoblasts. 



2. A colony, natural size. 



3. A planoblast shortly after liberation, very much magnified ; and, as it appears, with its tenta- 



cles extended when floating passively in the water , 



4. Terminal portion of a marginal tentacle of the planoblast, showing its continuous axial tube, 



and its ectodermal spherules loaded with thread-cells. 



