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GENUS II. AURELIANIA (Gosse). 



(Gen. nov.) 

 Corynactis (Thompson). 



Base expanded, adherent. 



Column conico-cylindrical, low, the margin forming 

 a thick parapet with a fosse. Surface smooth, without 

 suckers or loopholes : invested with a deciduous epi- 

 dermis. Substance firm and coriaceous, opaque. 



Disk flat, entire ; radii distinct. 



Tentacles in several rows, very short, knobbed ; the 

 heads more or less bilobate, and differing in form in 

 the different rows ; perfectly retractile. 



Mouth slit-like, furrowed : stomach-wall protrusile. 



ANALYSIS OF BRITISH SPECIES. 



Base greatly expanded : crimson augusta. 



Base not exceeding column : yellow heterocera. 



