44 



CORALS AND CORAL ISLANDS. 



It is readily distinguished from the Diploria by the ridges 

 between the furrows, these being simple and triangular. 



Still other forms of the Astraea tribe are foliaceous, or such 

 as would result if the growing margin of an Astrsea, or of a 

 Meandrina, were to spread out into folia instead of thickening 



DIPLORIA CEKEHRIFOKMIS, E. AND H. 



upward in the ordinary way. The groups ot gracefully curv- 

 ing leaves thus made are sometimes very large and sym- 

 metrical. 



2. Fungia tribe, or Fung ace a. — The general character of 

 the simple species of this tribe is mentioned on page 25, and 

 the character of the living Fungia, with its tentacles, is shown 

 in the figure of a Feejee species on page 26. The corallum 

 of another large species, the Fungia Dance, is represented 



