TUBIPORIDA, ' 219 
‘In Fig. 77 we have a representation of the animal of Zudiporu musica 
and its red corallum, which is sometimes designated by the common 
name of Organ Pipe Coral. In the engraving, 1 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 
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Fig. 77.—Tubipora musica (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 Linneus gave the name of Tudipora musica. But it is now 
known that there are several species of Zubzpora, readily distinguishable 
in a fresh condition, among other things by a difference in the colour 
