POLYZOA. 267 



Polypidom creeping, adherent and ramous; the cells 

 in one or more series. Alecto. 

 Family II. Polypidoms confervoid, jointed. CRisiADiE. 

 Polype-cells uniserial. CftisiDiA. 

 Polype-cells biserial. Crista. 

 ^^ Polypidoms calcareous or membrano-calcareous, multi- 

 form, composed of oblong or oviform cells, whose 

 subterminal aperture is closed by a membranous fold 

 or operculum. Celliporina. 

 Family III. Polypidoms branched in a confervoid man- 

 ner; cells oblong; no ovarian capsules. Eucra- 



TIAD^. 



t The polypidom erect. 



Cells produced in a single linear series. Eucratea. 

 Cells geminate. Gemellaria. 

 tt The polypidoms creeping, adnate. 



Cells linked, anastomosing. Hippothoa. 

 Cells scattered, erect. Anguinaria. 

 Family lY. Polypidoms massive^ or crustaceous, com- 

 posed of ovate cells in juxtaposition ; the aperture 

 often furnished with a globular capsule. Celli- 



PORID.E. 



Polypidom lobed or ramous ; cells heaped. Cellipora. 



7 



