SPONGES 



FIG. 19. 



Hyaloneniu, sp. 

 from Japan, with 

 symbiotic (polyps 

 (Palythoa) growing 

 on the upper por- 

 tion of the root- 

 tuft. (After Agas- 

 siz.) J. 



Fio. IS. 



rella phoenir, O.S. (After Agassiz.) 



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