ACTINARIA : ACTINIDjE. 



523 



from a broadly expanded disk used in locomotion ; ten- 

 tacles simple and in several rows near the margin. 



Figs- 5i5i 5 16 > 5*7- 



Sea-Anemone, M. inarginatum, Milne- Edw. Expanded, closed, and just opening. 



The Genus Bunodes has the column elongated, sub- 

 cylindrical in expansion, walls firm, with numerous prom- 

 inent papillae arranged in vertical lines corresponding to 

 the chambers within ; tentacles large, not numerous. 



B. stella, Verrill, of the coast of Maine and northward, 

 is about two inches high in the largest specimens, and 

 pale olive-green ; sometimes flesh-color. Fig. 506. It is 

 found among rocks. 



B. cavernata, Verrill, of the coast of South Carolina, is 

 about one inch and a half in diameter. 



The Genus Rhodactinia has the column low, shorter 

 than broad, the mouth large and often everted, and the 

 tentacles large with distinct openings at the ends. 



R. Davisii, Ag., is two inches or more in diameter, and 

 is found from Nantucket Shoals northward. 



The Genus Aulactinia has the base adherent, column 

 elongated, and the mouth with a fold at each angle, one 

 of which is much larger than the others. Below each 

 tentacle there is a three-lobed appendage. 



