7 
: TRIBE III— MADREPORACEA. 
Tentacles in a single series, twelve (rarely more), some- 
times ol)3olete : gemmiparous ; gemmation lateral : coral- 
ligenons ; cm'allum calcareous ; cells [calyces] quite small : 
rays [septa] six to twelve, or obsolete : interstitial surface 
not lamello-striate. [Not British.) 
TRIBE IV.— ANTIPATHACEA. 
Animals with six tentacles, forming at the base horny 
secretions (fleshy, enveloping a horny axis). [Not British.) 
TRIBE L— ASTR^ \CEA. 
ANALYSIS OF THE NON-CORALLIGENOUS FAMILIES. 
Base adherent at pleasure. 
Tentacles compound (Not Britiish) MetrkUada. 
Tentacles simple. 
Column pierced with loop-holes Sagartiada. ^ 
Colirmn imperforate. 
Column smooth. 
Margin simple AntJieadce. 
Margin beaded *. . . Actiniadoe. tyl 
Column waited Bunodidce. / St? 
Rise non-adherent. 
Lower extremity rounded, simple I/yanthida. J J 
Lower extremity inclosing an air-chamber Minyadida. 
