156 ANTHOZOA ASTEROID A. 



SYNOPSIS OF THE FAMILIES AND GENERA. 



Family I. PENNATULID^E. Polype-mass free, pennated, 

 carnous ; the skin spiculiferous ; the axis bony, simple, continuous : 

 polypes arranged along the margin of the pinnae. 

 Polypes on bipennated wings : 



Polypidom plumous .... PENNATULA. 

 Polypidom virgate .... VIRGULAEIA. 



Polypes unilateral, sessile : 



Polypidom linear- elongate . . . PAVONARIA. 



Family 1 1. GORGON I A D^. Polype-mass fixed, arborescent ; 

 the axis covered with a thick cretaceo-gelatinous celluliferous crust : 

 polypes scattered over the whole surface. 



Cells for the polypes immersed .... GORGONIA. 



Cells subpedunculated, protruded . . . PRIMNOA. 



Family III. ALCYONID^E. 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. 



Polypes aggregate ALCTONIUM. 



Polypes segregate SARCODICTYON. 



