SYNOPSIS OF THE FAMILIES AND GENERA. 



* Folypidoms calcareous ; the cells tubular with a round termiual 

 aperture uncovered with an operculum. Tubuliporina. 



Family TUBULIPORID^. Polypidoins multiform, massive or 

 critstaceotos. 



TuBULiPORA. Polypidom wart-like with a defined base, the cells 

 suberect, aggregated or imperfectly rowed. 



DiASTOPORA. Polypidom crustaceous, undefined, the cells hori- 

 zontal, semialternate. 



PusTULipoRA. Polypidom erect, branched, the cells opening all 

 round, semialternate or irregular. 



Idmonea. Polypidom dichotomous, the segments free, the cells in 

 alternating cross-rows on one surface. 



Alecto. Polypidom creeping, adherent and ramous, the cells in 

 one or more series. 



Family CEISIADJE. Poly2yidoms confervoid, jointed. 

 Crisiada. Polype-cells uniserial. 

 Crisia, Polype-cells biserial 



* * Polypidoms calcareous or membrano-calcareous, multiform, com- 



posed of oblong or oviform cells, whose subterminal aperture is 

 closed by a membranous fold or operculum. Celleporina. 



Family EUCRATIAD-^. Poly2ndoms branched in a confer- 

 void 77ianne7' ; cells oblong ; no ovarian cajjsules. 



+ The Polypidoms erect. 

 Eucratea. Cells produced in a single linear series. 

 Gemellaria. Cells geminate. 



t t The polypidoms creeping, adnate. 

 HiPPOTHOA. Cells linked, anastomosing. 

 Anguinaria. ^ells scattered, erect. 



Family CELLEPORID^. Polypidoms massive or crustaceous, 

 composed of ovate cells in juxta-position, the aperture terminal, often 

 furnished with a globular ca2'>sule. 



Cellepora. Polypidom lobed or ramous ; cells heaped. 



Lepralia. Polypidom crustaceous ; cells in a single layer. 



Membranipora. Polypidom crustaceous ; cells quincuucial. 



