CHARACTERISTIC DEEP-SEA TYPES. — CORALS. 



1;' 



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Rug'osa is only apparent, there being originally six primary 

 septa, two of the systems remaining gen- 

 erally undeveloped. The polyp of 

 Haplophiillla paradoxa is scarlet, with 

 about sixteen rather long tentacles. In 

 another species, Diutccmia harhadensis, 

 the polyp is deep flesh-colored, and 

 there are from 25 to 30 conical tenta- 

 cles with inflated tips. 



The Antipathidc^ constitute a very 

 natural and homogeneous group, hav- 

 ing the property of secreting a horny poly|3idom. One of the 

 most common West Indian species is Antipathes spiralis ; it 



. 481. — Haplophyllia para- 

 doxa. 2 (Pourtal^s.) 



Fig. 482. — Antipathes spiralis. \^ . 

 (Pourtales. ) 



Fig. 488. — Antipathes columnaris. f . 

 (Pourtales. ) 



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

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



