POLYPS AND CORALS. 67 



coarse sand, but rising above it when extended, March, 

 1855. Dr. William Stimpson. 



Anthopleura, sp. 



A species resembling the preceding. Simoda, Japan. 

 Dr. William Stimpson. 



Family, TnALASSiANTHiDiE. 



ThalassiantJiidce Verrill, these Proceedings, IV, p. 148, 1865 ; Trans. 

 Conn. Acad., t, p. 461, 1869. 



This family includes a great variety of forms, remark- 

 able in having branchiform organs which arise from the 

 disk, either within or outside of the circle of simple ten- 

 tacles, intermixed with them, or even wholly taking 

 their place. These organs may be simple or variously 

 lobed tubercles, or they may be elongated and variously 

 branched and subdivided, foliaceous or arborescent, and 

 often much laro'er than the true tentacles. 



■■s^ 



Subfamily, Phyllactin^. 



Plujllactinm Edw. and Haime, Corall., I, p. 291, 1857; Verrill, 1. c, 

 p. 462. 



Actiuians having both simple tentacles, and compound, 

 arborescent or foliaceous, tentacle-like, organs on the disk, 

 among the simple tentacles, or at the margin of the disk, 

 and homologous with the marginal verrucfe of Bunodes, 

 and other genera. These probably have the nature of 

 branchiffi. 



Amphiactis Verrill, gen. no v. 



Base broad. Column covered with prominent verrucse, 

 arranged in vertical lines. Simple tentacles in several 

 rows submarginal, with compound and much subdivided, 

 short, tentacle-like ora'ans both outside and inside of 

 them ; the hitter covering the disk more or less com- 

 pletely. 



This genus differs from Oulactis in having complex 



