( 506 ) 
CARNOSA. 
I. Free; marine; moving by tim contraction or expansion of the fleshy 
part; form symmetrical; axis of the body supported by a bone 
contained in a sac. 
Pennatula. 
Virgularia. 
II. Fixed or stationary. 
A. Polypiferous matter covering a solid axis. 
a. Axis with stellular discs — Lamellifera:. 
h. Stellular, discs terminal. 
Sarcinula. 
Lithostrotion. 
Caryophyllea. 
Turbinolia. 
Cyclolites. 
hb. Stellular discs aggregated. 
Explanaria. 
Astrea. 
Pontes. 
Pocillopora. 
m. Axis destitute of stellular discs. 
h. Axis corneous and flexible ; polypiferous basis cretaceous ; 
the axis with spines. 
c. Polypi developed. — Gorgoniada. 
Gorgonia. 
Primnoa. 
cc. Polypi not developed — C orallinada. 
lania. 
Corallina. 
• Halimeda. 
hb. Axis stony, 
Isis. 
B. Polypiferous basis destitute of a continuous solid axis. 
a. Polypi developed. 
b. Polypi with eight tentacula ; the basis fibrous. 
Lobularia. 
Cydonium. 
Cliona. 
bb. Polypi with tentacula exceeding eight in number ; basis 
nearly uniform. 
Alcyonium. 
Cristatella. 
aa. Polypi not developed.— Spongiada. 
Tethya. 
Halichondria, 
Spongia. 
Grantia. 
