804 



COMPENDIUM OF GENEKIO DISTINCTIONS. 



Suborder. ACTINARIA. Tentacles twelve or more. 

 Seldom tubercled ; radiating partitions often depositing 

 solid chalky plates. 



Family. ANTHEAD5!. Base adherent at pleasure. 

 Column smooth, not pierced ; edge simple. 



Qenus. ANTHEA. Base slightly adherent, broader than 

 column. Summit of column expanding. Tentacles numerous, 

 in several rows, very long, hardly retractile. 



Family. ILYANTHED^. Base not adherent, lower 

 extremity rounded and simple. 



Genut. ILYANTHOS. Tentacles of one kind, on edge. 

 Column thick and pear-shaped. Mouth simple. 



Genus. EDWARDSIA. Column slender, with epidermis. 



Family. SAGARTIAD.S!. Base adherent. Column 

 pierced. 



Genus. ACTINOLOB^E. Tentacles moderate. Disc re- 

 tractile. Column with suckers. 



Genus. SAGARTIA. Column with suckers. 



Family. BUNODID^l. Column warty. Base adherent. 

 Genus. BUNODES. Warts bold, arranged in vertical 

 lines. 



Family. ACTINIAD^!. Edge headed. 

 Genus. ACTINIA. Acontia wanting. Base much wider 

 than column. Tentacles wholly retractile. 



Family. LTJCERNABIADJE. No coral. Tentacles in re- 

 mote groups. (N.B. Mr. Gosse, in his "British Sea- 

 Anemones and Corals," excludes this family, believing it to 

 be properly placed with the Medusa?.) 



Genus. LUCERNABIA. Body bell-shaped, adherent or 

 free at will. Tentacles knobbed, in groups on angles of disc. 



Family. FUNGID-flS. Polypary free, rounded, or oval ; 

 convex above, concave below. Plates radiating from centre 

 to circumference. 



Genus. FONQIA. Round, the plates with very fine teeth. 

 Hot seas. 



Family. CABYOPHYLLEAD^]. Tentacles crowded; 

 mouth capable of protrusion. 



Genus. CARYOPHYLLEA. Corallum simple, or fixed oy 

 adhesion. Plates converging in three series ; sponge-like 

 mass of twisted plates at bottom of cup. Animal with mouth 

 ribbed ; tips of tentacles knobbed. 



Genus. LOPHOPHELIA. Corallum branched ; stem long, 

 tolid, and smooth. 



Family. GYROSA. Cells united into waving furrows. 

 Plates on both sides. 



Genus. MEANDKIXA. Polypary stony and hemispherical. 

 On convex side stars winding and lamellated. Hot seas. 



Genus. EuPHYLLJiA. Polypary leaf- like ; stars on both 

 sides. Hot seas. 



Family. MADREPORIDJE. Tentacles twelve, short; 

 polypary stony. 



Genus. MADREPORA. Cells lamellated, isolated ; inter- 

 stices prominent. Warm seas. 



Family. TUBULIPORID^!. Polypary composed of parallel 

 tubes, fixed by transverse partitions. 



Genus. TUBULIPORA. As Family. Indian seas. 



Family. CORTICATA. Polypary fixed, branching; axis 

 solid and stony. Polypes retractile. 



^ Genus. CORALLIUM. Shaft uniform, rigid, with five lon- 

 gitudinal furrows. Mediterranean. 



Genus. Isis Jointed ; the junctions homy. Hot seas. 



Sub-order. ALOYONARIA. Tentacles warty or plumed ; 

 branchlets perforated. Corallum, when present, mostly 

 chalky, sometimes horny, rarely flinty. 



Family. GORGONIAD/E. Fixed, plant-like, forming secre- 

 tions from epidermis. 



Genus. GoRGONiA. Axis horny ; not jointed. Crust soft 

 and fleshy. 



Family. PENNATTJLADjE. Free, and feather-shaped. 



Genus. PENNATULA. Shaft nearly cylindrical. Pin** 

 two-ranked and spreading, having polypes on upper edges, 



Genus. VIRGULARIA. Pol/pary long and slender ; polypes 

 on a series of curved projections. 



Family. ALCYONIHXS;. Polypary attached, fleshy, with 

 numerous chalky spicides ; irregular. 



Genut. ALCYONIUM. Polypary lobed; pores star-shaped, 

 from which the polypes emerge. 



Order. H YDROI DA Internal cavity simple, increasing 

 by buds from sides. 



Family. TTJBULARIAD5!. Buds not permanent, near 

 base of tentacles. Animals naked, or in horny tubular 

 envelope. 



Genus. TUBULARIA. Inclosed. Not branched. Polypes 

 with two circles of tentajles ; egg-germs on footstalks. 



Family. SERTTTLARIAD.S!. Egg-germs in vesicles. Buds 

 permanent, in horny envelope. Polypes in sessile cells. 



Genus. SERTULARIA. Plant-like; stem tubular, branolu-il. 

 and jointed. Cells alternate, or in pairs on opposite sidi-s. 



Genus. PLUMULARIA. Simple or branched, feathery; cells 

 mostly in angle of branches. Egg-vesicles scattered. 



Family. C AMPANTTLARIAD.S! . Cells on footstalks, rest 

 as in preceding family. 



Genus. CAMPAMILARIA. Creeping or erect ; cells at ends 

 of long-ringed stalks or in whorls; embryos uiedusa-shajieil. 



CLASS.-EOTIFERA. 



Microscopic, contractile, with cilia at front of bod>,-, 

 resembling wheels when in motion Intestines distinct ; 

 apertures two, one at each extremity of body. 



System as yet uncertain. 



CLASS KH1ZOPODA. 



Form mutable, no external organs or cilia Moviny lit/ 

 processes protruded or withdrawn at pleasure. 



System as yet uncertain. 



CLASS-INFUSORIA. 



Microscopic Form often mutable; no apparent tcsi-eh 

 or nerves Mostly with internal cavities. 



System as yet uncertain. 



CLASS.-PORIFERA. 





Form variou* t fixed, composed of horny fibres orjlinty vr 

 calcareous spiracles. 



System as yet uncertain. 



