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GENUS 1. AIPTASIA (Gosse). 
Anthea (Cocks). 
Base adhering to rocks, readily detached ; often not 
equalling the medium diameter of column. 
Column trumpet-shaped, many times higher than 
wide, very changeable in shape from irregular disten- 
sion ; margin tentaculate; surface minutely corrugated, 
adhesive, but without distinct suckers \ pierced with 
loop-holes. Substance pulpy. 
Bish greatly expanded, membranous, concave. 
Tentacles in several rows, long, lax, irregularly 
flexuous, perforate at the tip, the first row longest, 
scarcely retractile. 
Mouth not set on a cone ; lip thin ; stomach pro- 
trusile. 
Acontia abundant, but not often spontaneously 
extruded. 
The genus contains but one known species, 
A. Couchii. 
