CLASSIFICATIONS OF ZOOPHYTES. 453 



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. LAMELLIFEB^. 



b. Stellular discs terminal. 



Sarcinula. 



Lithostrotion. 



Caryophyllea. 



Turbinolia. 



Cyclotites. 

 b b. Stellular discs aggregated. 



Explanaria. 



Astrea. 



Forties. 



Pocillopora. 

 a a. Axis destitute of cellular discs, 



b. Axis corneous and flexible ; polypiferous basis cre- 

 taceous ; the axis with spines. 



c. Polypi developed. GORGONIADJS. 

 Gorgonia. 

 Primnoa. 



c c. Polypi not developed. COBALLINAD.E. 

 Jania. 

 Corallina. 

 Halimeda. 

 b b. Axis stony. 



7m, 



B. Polypiferous basis destitute of a continuous solid axis. 

 a. Polypi developed. 



6. Polypi with 8 tentacula ; the base fibrous. 

 Lobularia. 

 Cydonium. 

 Cliona. 



b b. Polypi with tentacula exceeding 8 in number j 

 basis nearly uniform. 

 Alcyonium. 

 Cristatella. 

 a a. Polypi not developed. SPONGIATXE. 



