134 



QENUS 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 j partly clothed with a tough 

 epidermis, which is rough externally, firmly adherent 

 to the skin. 



Disk concave ; the edge not undulate. 



Tentacles few, in more than one row ; barred. 



Mouth not raised on a cone j lip thickened. 



Acontia discharged, but reluctantly. 



ANALYSIS OF THE SPECIES. 



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



surface not warted murocincta. 



Epidermis dense ; firmly adherent throughout ; warted . gausapata. 



Epidermis thin ; firmly adherent throughout ; not warted picta. 



