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CARNOSA. 



I. Free; marine; moving by the 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 — LamelliferjE. 



b. Stellulai*, discs terminal. 

 Sarcinula. 

 Lithostrotion. 

 Caryophyllea. 

 Turbinolia. 

 Cyclolites. 



bb. Stellular discs aggregated. 

 Explanaria. 

 Astrea. 

 Porites. 

 Pocillopora. 



aa. Axis destitute of stellular discs. 



b. Axis corneous and flexible ; polypiferous basis cretaceous ; 



the axis with spines. 



c. Polypi developed — GorgoniadjE. 



Gorgonia. 

 Primnoa. 



cc. Polypi not developed — CorallinadjE. 

 Iania. 

 Corallina. 

 Halimeda. 



bb. Axis stony. 

 lsis. 



B. Polvpiferous 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 — SrONGiADiE. 

 Tethya. m 



Halichondria. 

 Spongia. 

 Grantia. 



