EXPLANATION OF THE PLATES. 



Fig. 



1. 

 2 



3. 

 4. 



PLATE 1. 



Tiara oceanica, sp. nov. 

 Turris pelagica, sp. nov. 

 Psythia prolifera, gen. et sp. nov. 

 Epenthesis rangiroee, sp. nov. 



PLATE 2. 



Fig. 



Gastric portion of the proboscis. 

 Portion of the bell-margin. 

 Mature medusa. 



Side view of mature medusa. 



Side view of a tentacle-bulb, showing the ec- 

 todermal ocellus. 



Terminal portion of one of the oral tentacles. 



Nematocyst capsules on the terminal portion 

 of one of the oral tentacles. 



Fie 



13. 

 14. 

 15. 

 16. 



PLATE 3. 



Dipleurosoma pacifica, sp. nov. 



<> tt 



Rhegmatodes lacteus, sp. nov. 



tt tt 



Oral view of mature medusa. 

 Portion of the bell-margin. 



Portion of the bell-margin. 



Fig. 17. Geryones mexicana, sp. nov. 



" 18. Carmaris rosea, sp. nov. 



" 19. Zonephyra corona, sp. nov. 

 « 20. " " 



PLATE 4. 



Immature medusa. 



Side view of mature medusa. 

 Oral view of one of the marginal sense or- 

 gans. 



