82 



CORALS AND CORAL ISLANDS. 



1. The Alcyonium tribe or Alcyonacea. — One of the 

 forms under this tribe is represented in the annexed figure. 

 It is from the Feejees (like most of the zoophytes figured 

 by the author), and in the living state the polyps had the mid- 

 dle portion of the tentacles pale brown, with the fringe deep 

 brown. In another more beautiful species of the genus, from 

 the same region, the Xenia fiorida D. (made Xenia Dance by 

 Verrill, as it proved to be distinct from Lamarck's species to 



Br 



XENIA ELONGATA, D. 



which the author referred it), the polyps are as large, but short- 

 er, and the color is a shade of lilac. These species differ from 

 the larger part of the Alcyonia in having the polyps not re- 

 tractile ; the tentacles fold together, if the zoophyte is disturb- 

 de, but cannot hide themselves. 



The following figure represents another related species 



