26 ZOOPHYTA. 



Sub-Order I. ACTINAEIA. 



Tentacles many, in imperfect series, or scat- 

 tered ; corallum (when present) calcareous, cells 

 many-rayed Astrteacea. 



Tentacles many, in 2 or more series : mostly 

 increasing by lateral buds ; corallum (when pre- 

 sent) calcareous, cells many-rayed . . . Caryophyllacea. 



TKIBE I. ASTE^EACEA. 

 With no corallum : 



Tentacles in uninterrupted circles . Actiniadce. 

 Tentacles in remote groups . . . 



FAMILY I. ACTINIAD^E. 



Analysis of the Genera. 

 Adherent: 



Tentacles scarcely retractile. 



Adhering base entire . . . 

 annular . . . 



Tentacles readily retractile. 



Tentacles knobbed . . . Corynactis. 

 truncate . . . Capnea. 



conical. 



Emitting filaments . . Sagartia. 

 Not emitting filaments. 

 Warted . . . 

 Smooth . . . 

 Not adherent : 

 Monotrematous. 



Anterior extremity normal. 



Tentacles equal . . . Ilyanthm. 



unequal . . . Arachnactis. 

 Anterior extremity forming a re- 

 tractile column . Edwardsia. 

 Ditrematous Peachia. 



Anthea (Johnst.). Body adherent, cylindrical; 

 tentacles numerous, scarcely retractile within the 

 body ; their bases united in clusters. 



