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CARNOSA. 



I. Free; marine; moving by the contraction or ejcpansion of the Jieshy 

 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 — Lamellifer.i;. 



b. Stellular, discs terminal. 

 Sarcinula. 

 Lithostrotion. 

 Caryophyllea. 

 TurbinoUa. 

 Cf/clolites. 



bb. Stellular discs aggregated. 

 Explanaria. 

 Astrea. 

 Pontes. 

 Pocillopora. 

 aa. Axis destitute of stellular discs. 



b. Axis corneous and flexible ; polypiferous basis cretaceous ; 



the axis with spines. 



c. Polypi developed — GorgoniadvE. 

 Gorgonia. 

 Primnoa. 



cc. Polypi not developed. — Corallinad^e. 

 lania. 

 Corallina. 

 Halimeda. 

 bb. 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 eiglit in number ; l)asis 

 nearly uniform. 

 Alcyonium. 

 Cristatella. 



aa. Polypi not developed.— Spongiad-e. 

 Tethya. 

 Halichondria. 

 Spongia. 

 Grantia. 



