130 



THREE CRUISES OF THE "BLAKE. 



ctenophores is the well-known Eucharis multicornis (Fig. 424), 

 also found in the Mediterranean. This genus, which had before 

 escaped observation on this side of the Atlantic, was observed at 

 the Tortugas and at Key West. 



Among the medusae called Discophorae by Agassiz, one of 



Fig. 424. Eucharis multicornis. i. (Chun.) 



the most interesting forms is Dodecdbostrycha dubia (Fig. 

 425), the largest specimen measuring no less than nine inches 

 in height. Several specimens of a dark claret-color were brought 

 up in the trawl, and it is very probable, from the systematic 

 affinities of this medusa, that, like its allies, the Rhizostomae, it 

 lives on the bottom, rarely coming to the surface. Belong- 

 ing also to the true deep-sea medusae are Periphylla, Atoll a, 

 and a few allied genera. The first genus has a more or less 



