CORAL-MAKIXH ACTINOLD POLYPS. 



53 



to the fact that only the lower parts of the polyp secrete coral, 

 as a moment's consideration will make apparent. 



In other cases, the budding cluster is small, and hence 



PORITES MOKDAX, D. 



makes small branches, as in the annexed figure of a species of 

 Porites, from the Feejees. The cells in this genus are very 

 small and nearly or quite superficial, as the figure shows. 



