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GENUS III. ElALCAMPA (Gosse). 
Actinia (Peach). 
Peachia (Gosse). 
Column long, slender, c}dindrical, or swollen at 
the inferior extremity, which appears to be imper- 
forate : no distinct margin. Surface without loop- 
holes, but studded with minute suckers. 
Dish flat. Radii distinct. 
Te?ifacles of one kind, few (less than twenty), 
marginal or sub-marginal, cylindrical, obtuse; per- 
fectly retractile. 
Mouth simple. No obvious gonidial development. 
ANALYSIS OF BRITISH SPECIES. 
Tentacles 12, banded ; lives in sand chrysanthellum. 
Tentacles 16, white ; lives in eroded rocks .... microps. 
