148 



edge of disk. Tentacles numerous, elongated, taper, flaccid, scarcely 

 retractile, longer than diameter of disk. 

 Type Anthea cereus. 



Actinia, Linnaeus. 



Body smooth, conoid or cylindrical. Tentacles numerous, in one 

 or more uninterrupted circles, conical, undivided, subequal and en- 

 tirely retractile, shorter than diameter of disk ; margin of upper 

 disk furnished with a row of tubercles. 



Actinia mesembryanthemum. 



Paractis, M.-Edw. 



Body smooth, conoid or cylindrical. Tentacles few in number, 

 in one or more uninterrupted circles, conical, undivided, subequal, 

 filiform, very long. No tubercles on the edge of the upper disk. 



Actinia viduata. 



Dysactis, M.-Edw. 



Tentacles forming two distinct circles, continuous at their base, 

 those of the inner row three times as long as the outer row, nume- 

 rous, short and subequal. Margin of disk without tubercles. 



Actinia biserialis. 



BB. Body studded more or less with verruciform tubercles or 

 sucking -glands. 



Cribrina, Ehrenb. 



Body studded with glandular warts irregularly placed, suctorial, 

 distributed over the whole surface of the body. Tentacles short, 

 thick, obtuse, subequal, very numerous. 



Actinia coriacea. 



Cereus, M.-Edw. 



Body with glandular warts, placed in vertical lines and unequal. 

 Tentacles not numerous, chiefly marginal, much spread and bent, 

 conical, rather stout ; length about equal to diameter of disk. 



Actinia gemmacea. 



Cyrtactis, mihi. 



Body rough, with sucking-glands in close-set perpendicular ridges 

 or vertical rows, and all equal, the whole height of the body. Centre 

 of disk much more raised than the edges. Disk greater in diameter 

 than the pillar of the body. Tentacles long, moderately slender, 

 generally horizontal to the disk, mostly marginal, their tips con- 

 stantly curled back. 



Actinia clavata. 



Heliactis, mihi. 



The glandular warts placed only on the upper portion of the body. 

 Tentacles very numerous, short, varying in length, crowded towards 





