582 



FOEMATION OF COEAL EEEFS. 



[Ch. XLIX. 



i- 



Fig. 147. 



Genera of Zoophytes most common in coral reefs. 



Astrcea dipsacea, Ehrenb. sp. Syn. Acanthastrcca grandls 



Milne Eclw. & J. Haimes. ' ' 



Fig. 148. 



Extremity of branch of 2/adrepo?x$ 



murkata, Lin, 



Pig. 150. 



?]>. 149. 



Ca 1 -yoplujlUa fastigiata , L am . 

 S^'ii. Eiismilia fastigiata^ 

 Milne Edw. k J. Haimes. 



Fig. 151. 



«^; 



r 



Porites clavaria, Lam. 



Oculbia hirtella, Lam. 



