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GENUS IV. PHELLIA (Gosse). 



Base adhering to rocks ; little exceeding the 

 column. 



Column pillar-like in expansion ; the margin ten- 

 taculate, 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 feAv, in more than one row ; barred. 



Mouth not raised on a cone ; lip thickened. 



Acontia discharged, but reluctantly. 



ANALYSIS OF THE SPECIES. 



Epidermis dense ; free and tube-like at the upper part ; its 



surface not warted murociitcta. 



Epidermis dense ; firmly adherent throughout ; warted . gausapata. 



Epidermis thin ; firmly adherent throughout ; not warted picta. 



