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GENUS I. BALANOPHYLLIA (Wood). 



Corattum simple, adherent, sub-pedicellate, cylin- 

 drical, or sub-conical. 



• Columella well- developed, but not projecting at the 

 bottom of the calice ; of a sponge-like appearance. 



Plates thin, close-set ; those of the last cycle well- 

 developed. 



Ribs distinct, narrow, nearly equal, crowded. 



The Animal is actinia-like, richly coloured, with a 

 protrusile mouth, not conspicuously furrowed, and 

 bluntly-pointed, warted tentacles, without terminal 

 knobs. 



There is only one British species, B. regia. 



