PLATE 8. 



Fig. I. Zancleopsls dichotoma. Tortugas, Florida, May 28, 1899. 



Figs. 2 and 3. Gemmaria costata ( ?), hydroid and medusa. Tortugas, 

 Florida, June, 1899. This is probably the hydroid of Zanclea 

 costata. 



Figs. 4 and 5. Zanclea gemmosa, young medusa. Figure 5 shows details of 

 nematocyst-capsules of the tentacles. Agassiz Laboratory, New- 

 port, Rhode Island, June 19, 1893. 



Fig. 6. Zanclea costata. Tortugas, Florida, May 15, 1906. 



Fig. 7. Zanclea costata. Details of nematocyst-knobs of tentacles. 



Figs. 8 and 9. Slabberia catenata. Tortugas, Florida, August, 1898. 

 Figure 9 shows end of one of the tentacles of the medusa shown in 

 figure 8. 



Drawn from life, by the author. 



