1 TRIBE III.— MADREPORACEA. 



Tentacles in a single series, twelve (rarely more), some- 

 times obsolete : gemmiparous ; gemmation lateral : coral - 

 ligenous ; corallum calcareous ; cells [calyces] quite small ; 

 rajs (septa) six to twelve, or obsolete : interstitial surface 

 not lamello-striate. (Not British.) 



TRIBE IT.— ANTIPATHACEA. 



Animals ■with six tentacles, forming at the base homy 

 secretions (fleshy, enveloping a horny axis). (Not British.) 



TRIBE I.— ASTFLEACEA. 



ANALYSIS OF THE NOX-CORALLIGEXOUS FAMILIES. 



Base adherent at pleasure. 



Tentacles compound (Not British; Metridiada. 



Tentacles simple. 



Column pierced with loop-holes Sagartiad'X. 



Column imperforate. 

 Column smooth. 



Margin simple Antheadie. 



Margin beaded Actiniadie. 



Column warted Btuiodida. 



Base non-adherent. 



Lower extremity rounded, simple Ilyantkida. 



Lower extremity inclosing an air chamber ( Not British ) Minyadida. 



