78 HISTORY OF BRITISH ZOOPHYTES. 
Family I. Polypes naked, or with only a rudimentary po- 
lypidom. CoryNIp&. 
+ Polypes naked. 
The tentacula scattered. Cava. 
The tentacula in one row. Hypractintia. 
tt Polypes with a horny cuticle. 
The tentacula with globose tips. CoRyYNE. 
The tentacula filiform. CorpyLoPHORA. 
Family II. Polypidom fistular; the tentacula whorled. 
TUBULARIAD&. 
+ The tentacula in a single whorl. Huprenprivm. 
tt The tentacula in a double whorl. 
Polypidom rooted. TuBuLaRia. 
Polypidom unrooted. CoryMoRPHA. 
** Ovisacs in the form of horny capsules or vesicles scat- 
tered on the polypidoms, and deciduous. SrRtTuLa- 
RINA, Lhrenberg. 
Family III. Cells of the polypes sessile. SERTULARIADZ. 
T Cells biserial. , 
Cells alternate, tubular. Hatrctum. 
Cells vasiform, everted. SERTULARIA. 
Cells conico-tubular, appressed. THUIARIA. 
tt Cells uniserial. 
