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GENUS III. HALCAMPA (Gosse). 



Actinia (Peach). 

 Peachia (Gosse). 



Column long, slender, cylindrical, or swollen at 

 the inferior extremity, which appears to be imper- 

 forate : no distinct margin. Surface without loop- 

 holes, but studded with minute suckers. 



Disk flat. Radii distinct. 



Tentacles of one kind, few (less than twentjr), 

 marginal or sub-marginal, cylindrical, obtuse; per- 

 fectly retractile. 



Mouth simple. No obvious goniclial development. 



ANALYSIS OF BRITISH SPECIES. 



Tentacles 12, banded ; lives in sand chrysanthellum. 



Tentacles 16, white ; lives in eroded rocks .... microps. 



