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GENUS III. ADAMSIA (Eorbes). 
Medv ^ a ^ (Bohadsch). 
Actinia (Adams). 
Cribrina (Ehrenb.). 
Base adhering to the inner lip of univalve shells ; 
greatly expanded laterally in two wing-like lobes, 
which, gradually advancing on each side, at length 
surround the mouth of the shell, and meet on the 
outer side of the body-whorl. 
Column greatly depressed; margin forming a low 
sharp parapet, with a distinct fosse. Surface smooth 
towards the summit, striated or irregularly furrowed 
on the outer (= lower) part ; pierced with loopholes, 
which, on the outer (= lower) part, form permanent 
warts. Substance fleshy. 
Bisky long-oval, almost linear, smooth. 
Tentacles numerous, sub -marginal, short, crowded, 
imperfectly retractile. 
Mouth protrusile, large, thrown into loose folds, but 
not furrowed. 
Acontia emitted freely and copiously. 
The genus contains but one known species, A. pal- 
liata. 
