28 



BRANCH CCELENTERATA 



Fig. 18. Athe'lia mirab'ilis. General view of branch. View of a calice. 

 (Vaughan, in Bull. U. S. F. C., 1900.) 



Fig. 19. Favia fragum (Esper). View of a corallum from the side. 

 (Vaughan, in Bull. U. S. F. C., 1900.) 



retracted tentacles until it looks like a round mass of flesh. The 

 tentacles are hollow and are armed with lasso cells, which are 



