454 CLASSIFICATIONS OF ZOOPHYTES. 



Tethya. 

 Halichondria. 

 Spongia. 

 Grantia. 



II. CELLULIFERA. 



POLYPI LODGED IN CALCAREOUS CELLS IMPERFOKATE AT THE BASE. 



A. Substance rigid, stony. 



I. Cells in the form of minute pores, imbedded. MILLE- 



PORADJE. 



Millepora. 



II. Cells tubular, and produced beyond the surface. TUBI- 



PORADJE. 



Tubipora. 



Favosites. 



Tubulipora. 



Discopora. 



Filipora. 



Terebellaria. 



III. Cells utriculur, adjacent, or superimposed. ESCHA- 



RADJE. 



Bschara. 

 Retepora. 

 Cellepora. 

 Berenicea. 

 Hippothoa. 

 Alecto. 



A A. Substance flexible. FLUSTRADJE. 

 Farcimia. 

 Flustra. 



III. THECATA. 



POLYPI SURROUNDED BY A MEMBRANACEOUS TUBE, COVERING THE 

 SUBDIVISIONS OF THEIR COMPOUND BODY. 



A. Sheath slightly calcareous ; cells single, or in rows. 



I. Sheath slightly calcareous, cells enlarged, in rows, united or 

 single. CELLARIAD^;. 

 a. Cells united. 



b. Cells with the orifices opening on the upper surface. 

 Cellularia. 

 Tricellaria. 

 Crisia. 



