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OENUS IV. PHELLIA (Gosse). 
Base adhering to rocks ; little exceeding the 
column. 
Column pillar-like in expansion ; the margin ten- 
tacidate, without parapet or fosse. Surface smooth, 
pierced with loop-holes ; partly clothed with a tough 
epidermis, which is rough externally, firmly adherent 
to the skin. 
Bisk concave ; the edge not undulate. 
Tentacles few, in more than one row ; barred. 
Mouth not raised on a cone ; lip thickened. 
Acontia discharged, but reluctantly. 
ANALYSIS OF THE SPECIES. 
Epidermis deu.se ; free and tube-like at the upper part ; its 
surface not warted murocincta. 
Epidermis dense ; firmly adherent throughout ; warted . grajfsa^ata. 
Epidermis thin ; firmly adherent throughout ; not warted picta. 
