CLASSIFICATIONS OF ZOOPHYTES. 453 



fleshy part ; form symmetrical ; axis of the body suppoiied 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^. 



b. Stellular discs termiual. 



Sarcinula. 



Lithostrotio7i. 



Caryopliyllea. 



Turbinolia. 



Cyclotites. 

 b b. Stellular discs aggregated. 



Bx2}lanaria. 



Astrea. 



Forites. 



Focillojjora. 

 a a. Axis destitute of cellular discs. 



b. Axis corneous and flexible ; polypiferous basis cre- 

 taceous ; the axis with spines. 



c. Polypi developed. — GtORGoniad^. 

 Gorgonia. 

 Primnoa. 

 c c. Polypi not developed. — Corallinad^. 

 Jania. 

 Corallina. 

 Halinieda. 

 b b. Axis stony. 

 I sis. 

 B. Polypiferous basis destitute of a continuous solid axis. 

 a. Polypi developed. 



b. Polypi with 8 tentacula ; the base fibrous. 

 Lobularia. 

 Cydonium. 

 Cliona. 

 b b. Polypi with tentacula exceeding 8 in number ; 

 basis nearly uniform. 

 Alcj'onium. 

 Cristatella. 

 a a. Polypi not developed. — Spongiad^. 



