60 



ORGANIC DEPENDENCE AND DISEASE 



Fig. 48. Caimopora; a stromatoporoid colony showing the tubes of Syringopora, 

 a coral that lived eommensally with it. 



Fig. 49. Schematic section showing the structiu-e of the coral tubes 

 in the stromatoporoid mass. Onondaga limestone (Lower Devonian). 



currences and this association of the hydroid with the zoan- 

 tharian corals is widespread. Other occurrences of this 

 sort are well known and we figure here a colony of the 

 honeycomb coral Favosites which has overgrown a small 

 plantation of the cyathophylloid coral Amplexus. In all 

 these associations there has been apparently no interfer- 

 ence with the functions of either member of the combina- 

 tions. Naturally, as these are merely incidents of their 

 growth they have been carried onward into recent coral 

 plantations where such combinations are not infrequently 

 noted. 



