52 CORALS AND CORAL ISLANDS. 
a stem rises, with the budding cluster of polyps at its summit, 
and the more aged, or non-budding polyps, about its sides ; and 
the breadth of the stem depends on the size of the budding 


























































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GONIOPORA COLUMNA, D. 
cluster. Above a case of this kind is represented, in which 
the stem is a large column. . 
The polyps, in this beautiful Pacific species, as seen, stand 
up prominently over the coral when expanded, which is due 
