PLATE 1 1 . 



Figs, i and 2. Stotnotoca rugosa, young and mature. Newport, Rhode 

 Island, August 4, 1892. 



Fig. 3. Young medusa of Perigonimus jonesii. Agassiz Laboratory, New- 

 port, Rhode Island, August 22, 1896. 



Fig. 4. Young medusa of Perigonimus jonesii. Agassiz Laboratory, New- 

 port. Rhode Island, July, 1896. 



Fig. 5. Stotnotoca octaedra, young medusa. Tortugas, Florida, July 17, 

 1898. 



Fig. 6. Stomotoca octaedra, Tortugas, Florida, June, 1897. 



Fig. 7. Pandca violacca. Aboral view of gonads of the medusa shown in 

 figure i, plate 12. 



Drawn from life, by the author. 



