REPORT ON THE ANT1PATUAR1 A. 33 



Agassiz calls attention to the fact first noted by Pourtales, that in certain species of 

 Antipathidse the small twigs on the stem and branches of the corallum may be modified 

 so as to form a tube serving for the protection of parasitic annelids (Ma/rphysa, &<•.). A 

 similar action of parasitic annelids has been noticed in Lophohelia, Stylaster, AUopora, 

 &c. Agassiz, in an earlier account of certain dredging operations of the "Blake" (66), 

 noticed that the Antipathidse, like certain Gorgonidse (especially Riisea), showed a lirighl 

 bluish phosphorescence when coming up in the trawl. 



{ZOOL. CHAM,. EXP.— PART L.XXX. 1889.) ''' '' 



