XU CHARACTERS OF FAMILIES, ETC. 



Family — SELENARiADiE. 

 Polyzoarium free (?) ; orbicular orirregular, conical or depressed, 

 convex on one side and plane or concave on tlie other ; com- 

 posed of a single layer of cells, usually of two kinds, wliicli open 

 on the convex surface only. 



Family — Theonid^. 



Polyzoarium massive, subglohose, or irregular. Cells con- 

 tiguous, crowded. 



