CLASSIFICATIONS OF ZOOPHYTES. 69 



Corallina. 

 Halimeda. 

 b b. Axis stony. 

 Isis. 

 B. Polypiferous basis destitute of a continuous solid axis. 

 a. Polypi developed. 



b. Polypi with 8 tentacula ; the base fibrous. 

 Lobularia. 

 Cydoniura. 

 Cliona. 

 b b. Polypi with tentacula exceeding- 8 in number ; 

 basis nearly uniform. 

 Alcyonium. 

 Cristatella. 

 a a. Polypi not developed. — Sposgiad^. 

 Tethya, 

 Halichondria. 

 Spongia. 

 Grantia. 



II. Cellulifera. 

 Polypi lodged in calcareous cells imperforate at the 



BASE. 



A. Substance rigid, stony. 



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



PORADiE. 



Millepora. 



II. Cells tubular, and produced beyond the surface. — Tu- 



BIPORAD^. 



Tubipora. 

 Favosites. 

 Tubulipora. 

 Discopora. 

 Filipora. 

 Terebellmna. 

 III. Cells uti'icular, adjacent, or superimposed. — Escha- 



RADJE. 



Eschara. 

 Retepora. 

 Cellepora. 

 Berenicea. 



