Anthozoa 147 



the more convenient it was, as stated above, the one used in most of the 

 experiments. 



After the planulae had attached themselves to the terra-cotta discs 

 and had begun to form small colonies, the discs were affixed to the heads 

 of iron stakes driven into the sea bottom at convenient places where the 

 discs would always be submerged at the lowest tides. Through the end 

 of the stake, which extended through the central perforation of the 

 disc, there was a hole in which an iron pin was placed. This pin held 

 the disc firmly on the head of the stake. By this means colonies of 

 both Favia fragum and Porites astrcoides were reared to an age of five 

 years. The diameter of the colonies of Favia fragum for colonies five 

 years old ranged from 28.5 to 38 mm., that of the colonies of Porites 

 astrcoides ranged from 41 to 99.75 mm. The height of the colonies of 

 Favia fragum at five years of age ranged from 13.5 to 22 mm., that of 

 colonies of Porites astrcoides ranged from 18 to 54.4 mm. 



Bibliography 



Vaughan, T. W. 1910. The recent Madreporaria of southern Florida. Carnegie 



Inst, of Washington, Year Book 9:135. 

 1 91 1. The Madreporaria and marine bottom deposits of southern Florida. 



Ibid. 10:147. 



1919. Corals and the formation of coral reefs. Smithsonian Inst. Publ. 



2506, Report of 1917:189. 



