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GENUS I. ACTINOLOBA (Blainv.). 
Actinia (Linn.). 
Cribrina (Ehrenberg). 
Sayartia (Gosse). 
Base considerably broader than the column ; its 
outline often undulate, but entire. 
Column pillar-like, in the expanded state ; the 
margin forming a thickened parapet, or low wall, 
separated from the tentacular disk by a groove or 
fosse. Surface perfectly smooth, without suckers, 
but pierced with loop-holes. Substance approaching 
to pulpy. 
Bisk deeply frilled at the margin ; thinly mem- 
branous. 
Tentacles short, slender, not arranged in distin- 
guishable circles, scattered at their commencement 
about half-breadth, of the disk, becoming gradually 
smaller, more numerous and densely crowded as they 
approach the border. 
Mouth surrounded with a thick lip ; furnished with 
only a single gonidial groove, surmounted by a single 
pair of tubercles. 
Acontia emitted somewhat reluctantly, but copi- 
ously upon occasion. 
Only one British species. 
