TUBIPORIDM. 



219 



In Fig. 77 we have a representation of the animal of Tubipora imisica 

 and its red corallum, which is sometimes designated by the common 

 name of Organ Pipe Coral. In the engraving, i is the calcareous 

 corallum, reduced to half its size ; 2, is a portion about the natural 

 size ; 3, magnified, and containing the polyp which occupies the 

 summit of the tube, and which forms this curious coral ; 4, is the 



4im-¥,^ 



Fig. 77. — Tubipora miisica (Linn.), half the natural size. 



poylp magnified ; 5, the crown of delicately-fringed tentacula of an 

 individual polyp. 



Zoologists of the last century confounded all the species of this 

 genus inhabiting the tropical seas, making only one species, that to 

 which Linnaeus gave the name of Tubipora musica. But it is now 

 known that there are several species of Tubipora, readily distinguishable 

 in a fresh condition, among other things by a difference in the colour 



