10 



ANALYSIS OF THE GENERA. 



Tentacles moderately long, slender. 

 Disk perfectly retractile. 



Column destitute of suckers Actinolola. 



Column furnished with stickers Sagartia. 



Column clothed with a rough epidermis . . . Phellia. 

 Disk imperfectly retractile. 



Base annular; parasitic on shells Adamsia. 



Base entire ; not parasitic Gregoria. 



Tentacles mere warts ; set in radiating bands {Not 



British) ... JJiscosoma. 



