G4-2 



<'OMPKXI>llM OF GENERIC DISTINCTIONS. 



Genus. Meandrixa. — Polypary stony and hemispherical. On 

 convex side .stars winding ami Lamellated. 11« >t seas. 



Genus. Euphyll.-ea. — Polypary leaf-like; stars on both sides. 

 Hot seas. 



Family. MADREPORIDiE.— Tentacles twelve, short; poly- 

 pary stony. 



Genus. Madrepora. — Cells lamellated, isolated; interstices 

 prominent. Warm seas. 



Family. TUBUL1P0RID5:. -Polypary composed of parallel 

 tubes, fixed by transverse partitions. 



Genus. Tubulipora. — As Family. Indian seas. 



Family. COKTICATA.— Polypary fixed, branching; axis solid 

 and stony. Polypes retractile. 



Genus. CuRALLIUM. — .Shaft uniform, rig-id, with five longi- 

 tudinal furrows. Mediterranean. 



Genus. Isis. — Jointed; the junctions horny. Hot seas. 



Sub-order. ALCYONARIA — Tentacles warty or plumed; 

 branchlets perforated. Corallum, when present, mostly chalky, 

 s tunes horny, rarely flinty. 



Family. GORGONIAD.ffi.— Fixed, plant-like, forming secre- 

 tions from epidermis. 



Germs. Gorgonia. — Axis horny; not jointed. Crust, soft and 

 fleshy. 



Family. PENNATULADiE.-Frce, and feather-shaped. 



Genus. Pennatuxa. — Shaft nearly cylindrical. Pinnae two- 

 ranked and spreading, having polypes on upper edges. 



Genus. Virgularia. — Polypary long and slender; polypeson 

 a series of curved projections. 



Family. ALCYONIIDiE — Polypary attached, fleshy, with nu- 

 merous chalky spicules; irregular. 



Genus. Alcyoniom. — Polypary lobed; pores star-shaped, 

 from which the polypes emerge. 



Order. HYDROIDA. — Internal cavity simple, increasing by 

 bods from sides. 



Family. TTJBULARIADJE. -Buds not permanent, near base 

 of tentacles. Animals naked, or in horny tubular envelope. 



Gemm. Tubularia. — Inclosed. Not branched, Polypes 

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



Family. SERTULARIADJE— Egg-germs in vesicles. Puds 

 permanent, in horny envelope. Polypes in sessile cells. 



Genus. Sertularia. — Plant-like; stem tubular, branched, 

 and jointed. Cells alternate, or in pairs on opposite sides. 



i;i-imf. Pmjmularia. — Simple or branched, feathery; cells 

 mostly in angle of branches. Egg-vesicles scattered. 



Fat, nly. CAMPANULARIADJE — Cells on footstalks, rest as 

 iii preceding family. 



Genus. Campandlaria. — Creeping or erect; cells at ends of 

 long-ringed stalks or in whorls; embryos medusa-shaped. 



CLASS.— ROTIFERA. 



Microscopic, contractile, with cilia tif front of body, 

 resembling wheels when, in mat inn — Intestines dis- 

 tinct; apertures two, uncut each extremity of body. 



CLASS.— RIIIZOPODA. 



Form mutable, no external organs or cilia — Moving 

 by processes protruded or withdrawn at pleasure. 



CLASS.— INFUSORIA. 



Microscopic — Form often mutable; no apparent vessels 

 or nerves — Most/// with internal cavities. 



CLASS.— PORIFERA. 



Form various, fixed, composed of horny fibres or flinty 



or calcareous spiracles. 



