CLASSES. 



1st Class. Celluliferous Polypidoms in non-irri- 

 table cells. — 3 Orders. 



2nd Class. Calciferous Polypidoms. Calcareous 

 substance, united with animal substance, or incasing 

 it : apparent in all circumstances. — 3 Orders. 



3rd Class. Corticiferous Polypidoms, composed 

 of two substances ; one exterior and enveloping, called 

 Rind, or Incrustation ; the other named Axe, placed 

 within, and supporting the first.— 3 Orders. 



4th Class. Carnoid Polypidoms. A fleshy mass, 

 wholly animated, covered with polypi, but having no 

 central axe. — No Order. 



