CHARACTERISTIC DEEP-SEA TYPES. -CORALS. 



Rugosa is only apparent, there being originally six primary 

 septa, two of the systems remaining gen- 

 erally undeveloped. The polyp of 

 HaplopliiflUa paradoxa is scarlet, with 

 about sixteen rather long tentacles. In 

 another species, Duncania barbadensis, 

 the polyp is deep flesh-colored, and , 

 there are from 25 to 30 conical tenta- 

 cles with inflated tips. 



The Antipathidse constitute a very Fig- 481. - - Hapiophyiiia para- 



-. i doxa. -?. (Pourtales.) 



natural and homogeneous group, hav- 

 ing the property of secreting a horny polypidom. One of the 

 most common West Indian species is Antipathes spiralis; it 



Fig. 482. Antipathes spiralis. 

 (Pourtales.) 



Fig. 483. Antipathes columnaris. - t . 

 (Pourtales.) 



has been dredged from no less than twenty-three stations, in 

 depths ranging from 45 to nearly 900 fathoms. The polyps of 



