PENNATULA. 193 



Polj^es on bipennated wings. 



Polypidom plumous. Pennatula. 

 Polypidom virgate. Yirgularia. 

 Polypes unilateral, sessile. 



Polypidom linear, elongate. Pavonaria. 

 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. Goegoxia. 

 Cells subpedunculated, protruded. Primnoa. 

 Family III. Polype-mass fixed, coriaceous or somewhat 

 carnous, without any distinct axis, but strengthened 

 by variously- disposed calcareous spicula; polype-ceUs 

 subcutaneous, scattered over the surface. ALCYOXiDiE. 

 Polypes aggregate. Alcyonium. 

 Polypes segregate. Sarcodictyon. 



Family PENNATULID^. 

 Genus XYI. PENNATULA, Cuvier. 



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

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

 flattened, and polypiferous along the upper margin. — Johnston. 



o 



