PENNATULA. 193 



Polypes on bipennated wings. 



Polypidom plumous. PENNATULA. 

 Polypidom virgate. VIEGULARIA. 

 Polypes unilateral, sessile. 



Polypidom linear, elongate. PAVONAEIA. 

 Family II. Polype-mass fixed, arborescent ; the axis covered 

 with a thick cretaceo- gelatinous celluliferous crust; 

 polypes scattered over the whole surface. GORGONIAD^E. 

 Cells for the polypes immersed. GORGONIA. 

 Cells subpedunculated, protruded. PKIMNOA. 

 Family III. Polype-mass fixed, coriaceous or somewhat 

 carnous, without any distinct axis, but strengthened 

 by variously- disposed calcareous spicula ; polype-cells 

 subcutaneous, scattered over the surface. ALCYONID.E. 

 Polypes aggregate. ALCYONIUM. 

 Polypes segregate. SARCODICTYON. 



FAMILY PENNATULIDJE. 



Genus XYI. PENNATULA, Cuvier. 



Gen. Char. Polype-mass free, plumous, the shaft subcylindric, 



naked beneath, pennated above ; pintia3 two-ranked ; spreading, 



flattened, and polypiferous along the upper margin. Johnston. 



