PLATE 19. 



Fig. 1. Niolna dendrotentacula, young medusa immediately alter being set 



free from the parent. Tortugas, Florida, May, 1899. 

 Fig. 2. Niobia dendrotentacula. Side view of medusa showing the manner 



in which the tentacles develop into medusae. 

 Fig. 3. Niobia dendrotentacula. View of manubnum ot mature medusa 



after the budding process has ceased and the ova become mature. 

 Fig. 4. Niobia dendrotentacula. Diagram showing the sequence in which 



the medusa buds are set free from the parent medusa; " I " is set 



free first, "7" last. 

 Fig. 5. Niobia dendrotentacula. Oral view showing the order in which 



medusa buds are developed at the tentacle-bases. Tortugas, 



Florida, May 25, 1899. 



Drawn from life, by the author. 



