CHARACTERISTIC DEEP-SEA TYPES. CORALS. 



155 



Rugosa is only apparent, there being originally six primary 

 septa, two of the systems remaining gen- 

 erally undeveloped. The polyp of 

 Haplophyllia jjaradoxa is scarlet, with 

 about sixteen rather long tentacles. In 

 another species, Duncama 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 

 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. 481. 

 doxa. 



Haplophyllia para- 

 (Pourtalfes.) 



Fig. 482. - Antipathes spiralis. \ (> . 

 (Pourtales.) 



Fig. 483. Antipathes columnaris. 

 (Pourtalfcs.) 



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

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



