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 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 Antipathidee constitute a very 
natural and homogeneous group, hav- 
Fig. 481. — Haplophyllia para- 
doxa. 3. (Pourtalès.) 
ing the property of secreting a horny polypidom. One of the 
most common West Indian species is Antipathes spiralis ; it 
M % 4 4 " . Qc : : 
Fig. 482, — Antipathes spiralis. 10, Fig. 483. — Antipathes columnaris. 3. 
(Ponrtalos.) 
(Pourtales.) 
has been dredged from no less than twenty-three stations, in 
depths ranging from 45 to nearly 900 fathoms. The polyps of 
