474 



KADIATA : POLYPI. 



are communities arranged on a more or less expanded 

 disk which has a sort of stem by means of which the 

 community moves about or fixes itself in the sand. These 



Fiu. 710. 



R. Dana;, Verrill. Single polyp enlarged. 



Renilla Dance, Verrill. 



FIG. 711. 



Sea-pen, Veretillum. 



communities are from two to ten inches in length, accord- 

 ing to the kinds. All belong to the warm regions. 



The Gorgonias and their allies the Gorgonacea of 

 authors are much branched, and many of them are much 



