COMPENDIUM OF GENERIC DISTINCTIONS. 



789 



Genus. ^fiTEA. Cells tubular, erect, from creeping fibre. 

 Britain, &c. 



Genus. BEANIA. Polyzoary horny or chalky. Cells rising 

 from slender tube and open in front ; edges with hollow 

 spines. Britain, &c. 



Family. FARCIMINARIAD-ffi. Cells round imaginary 

 axis, alternate ; polyzoary erect, dichotomous. 



Genus. FARCIMINARIA. Cells horny, flexible ; edge raised ; 

 apertures large. Tasmania. 



Family. GEMELLABIAD.ffi. Cells opposite, in pairs. 



Genus. GEMELLARIA. Cells back to back, pairs facing 

 same way ; aperture oval, oblique. Britain, &c. 



Genus. DIMETOPIA. Cells back to back ; pairs at right 

 angles. Bass's Straits. 



Genus, NOTAMIA. Avicularia tobacco-pipe-shaped above 

 each pair of cells. Britain. 



Family. CABEBEAD^E. Polyzoary dichotomous ; vi- 

 bracula or sessile avicularia one to several cells. 



Genus. CABEREA. Vibracula large, on back of branches. 

 Algoa Bay, &c. 



Family. BICELLARIAD.ffi. Vibracula none. Polyzoary 

 dichotomous. 



Genus. BICELLARIA. Cells distinct ; aperture upwards; 

 several spines. Britain, &c. 



Genus. BUGULA. Cells elliptical, contiguous ; aperture 

 large. Britain, &c. 



Family. FLTTSTRAD.3!. Polyzoary flat, flexible, leafy, 

 erect. Cells many. 



Genus. FLUSTRA. Cells contiguous, both sides of frond. 

 Britain, &c. 



Genus. CARBASEA. Cells contiguous, one side of frond. 

 Britain, &c. 



Genus. DIACHORIS. Cells separate, each connected with 

 six others by tubular processes. Bass's Straits. 



Family. MEMBRANIPORID^!. Polyzoary flat, chalky, 

 mostly encrusting. Cells horizontal. 



Genus. MEMBRANIPORA. Cells irregular or quincuncial, 

 with raised margins ; part of front membranous and flexible. 

 Britain, &c. 



Genus. LEPRALIA. Polyzoary encrusting, spreading from 

 centre. Britain, &c. 



Family. CELLEPORID.32. Cells vertical to axis or plane, 

 heaped or ir.egular. 



Genus. CELLEPORA. Polyzoary chalky, rigid, heaped or 

 quincuncial. Ascending beak or mouth, with avicularium. 



Family. ESCHARIDJE. Polyzoary erect; cells quin- 

 cuncial in same plane. 



Genus. ESCHARA. Cells on both surfaces, back to back, 

 horizontal to plane of axis. Britain, &c. 



Genus. RETEPORA. Polyzoary leafy, chalky, net-like. 

 Cells immersed, open on surface. 



Family. SELEN ARIADNE. Polyzoary flat and rounded, 

 plano-convex or concave. Vibracula large and strong. 



Genus. CUPULARIA. Each cell with vibraculum at apex. 

 Warm seas. 



Genus. LuNXTLiTES. Cells in series from middle, bifur- 

 cating ; vibracula in alternate lines. Warm seas. 



Genus. SELENARIA. Cei tain cells with vibracula. Bass's 

 Straits. 



Sub-order. CYCLOSTOMATA. Cell with round simple 

 orifice. 



Family. CEEISIADiE. Polyzoary planet-like, jdnted 

 and branched. Cells tubular, in one or two series ; orifices 

 in opposite directions. 



Genus. CERISIA. Cells in two rows ; orifices at tips. 



Family. TTJBULIPORAD^l. Polyzoary solid, chalky, 

 circular, lobed or two-branched. Cells tubular ; orifice roun 1 

 and prominent. 



Genus. PUSTULOPORA. Erect, cylindrical ; cells half 

 sunken ; orifice prominent. 



Genus. IDMONEA. Erect, two-branched. Cells on one 

 side, in rows, divided by a longitudinal line. 



Genus. DISCOPORA. Base thin, sessile and cup-shaped. 



Genus. ALECTO. Creeping, branched irregularly. Cells 

 horizontal, in one or more rows ; ends free. 



Genus. TUBULIPORA. Base defined, branch-like. Cells 

 nearly erect, aggregate or in imperfect rows. 



Family. VESICULARIAD^!. Polyzoary plant-like, horny, 

 tubular ; cells free, exteriorly flexible. 



Genus. BOWERBANKIA. Mottled and creeping, or erect 

 and branched irregularly. Cells thickly clustered. Animals 

 eight to ten tentacles. 



Genus. SERIALARIA. Cells aggregated in sets, on a stalk 

 and on same side ; animals with eight tentacles. 



Genus. BUSKIA. Cells nearly separate, on footstalks, 

 and flask-shaped, with short processes from walls. 



Family. ALCYONIDIAD^J. Polyzoary spongy, irre- 

 gular ; orifice of cells contractile. 



Genus. ALCYONIDIUM. Polyzoaiy erect, lobed or simple. 

 Cells sunken and five- angled. 



Family. PEDICELLINAD.S!. Polyzoary plant - like, 

 creeping, adherent, from which spring polypes on foot- 

 stalks. 



Genus. PEDICELLINA. Animal globular. Tentacles curled 

 inwardly, not retractile. 



Order. PHYLACTOIi.ffiMATA Lophophore bilateral; 

 mouth with epistome. 



Sub-order. LOPHOPEA. Arms of lophophore free. 



Family. CRISTATELLID-S!. Polyzoary free and loco- 

 motive. 



Genus. CRISTATELLA. Only genus. 



Family. PLTJMATELLID^!. Polyzoary rooted. 



Sub-family. Lophophore with two long arms. 



Genus. LOPHOPUS. Polyzoary bag-shaped ; ectocyst 

 gelatinous ; statoblasts oval ; no spines. Britain, &c. 



Genus. PECTINATELLA. Polyzoary massive ; ectocyst 

 gelatinous ; statoblasts disc-shaped, with spines. Britain, &c. 



Genus. ALCYONELLA. Polyzoary tubular, tubes united ; 

 ectocyst membranous. Britain, &c. 



Genus. PLUMATELLA. Polyzoary tubular, tubes distinct, 

 Britain, &c. 



Sub-family. Arms of lophophore nearly funnel-shaped. 

 Genus. FREDERICELLA. Only genus. 



