28 



BRANCH CCELENTERATA 



Fig. 18. — Athe'lia miral/ilis. General view of branch. View of a calice. 

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



Fig. 19. — Favia fragum (Esper). ^'iew of a coralhim from the side 

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



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

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



