84 



CORALS AND CORAL ISLANDS. 



Aulopora ; but generally vertical tubes, grouped into large red 

 masses, called, popularly, Organ-pipe coral. A portion of one 

 of the latter — Tubipora syringa D. — is represented in the 



TELESTO RAMICULOSA, V. 



first of the following figures, with its expanded polyps ; and a 

 polyp from the group much enlarged in the second figure. 

 The papillae of the fringe are arranged closely together in a 



TUBIPORA SYRINGA, D. AND T. PIMBRIATA, D. 



plane, so that it is not at first apparent that there is a fringe. 

 The third figure represents, enlarged, the polyp of another Fee- 

 jee species, the Tubipora fimbriata D. Such coral masses 

 are sometimes a foot or more in diameter, and the living zoo- 



