60 ORGANIC DEPENDENCE AND DISEASE 





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

 a coral that lived commensally with it. 



Fig. 49. Schematic section showing the structure of the coral tubes 

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



currences and this association of the hyclroid 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. 



