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GENUS I. CAPNEA (Forbes). 



Base expanded, swollen, adherent. 



Column cylindrical, pillar-like j the margin forming 

 a thick parapet, with a fosse. Surface smooth, without 

 loopholes, invested with a woolly epidermis. 



Disk circular, entire. 



Tentacles very short, truncate, retractile. 



But one species is known, C. sanguinea 



