174 



PHYLUM CCELENTERA. 



(3) Cubomedusae. Forms with broad pseudo-velum, and other 



peculiar features. Charybdea. 



(4) Peromedusae. Forms with four inter-radial tentaculocysts 



only. Pericolpa. 



Class III. ANTHOZOA ( = Actinozoa) 



Polypoid forms with well-developed gullet and septa, and circumoral 

 tentacles. 



(1) Zoantharia or Hexacoralla. 



(a) Actiniaria. Sea-anemones. Actinia^ Anemonia, Tealia t 



Ccrianthus. 



(b) Madreporaria. Stone or reef corals. 



AstrcBd) Madrepora, Fungia, Maandrina. 



(c) Antipatharia. " Horny " black corals. Antipathes. 



(2) Alcyonaria or Octocoralla. 



Alcyonium (Dead-men's-fingers), Tubipora (Organ-pipe 

 coral), Corallium (Red coral), Gorgonia, Pennatula (Sea- 

 pen), Monoxenia (non-colonial). 



Class IV. CTENOPHORA 



Delicate free - swimming organisms, generally globular in form, 

 vnoving by means of eight meridional rows of ciliated plates, or comb- 



FIG. 91. Diagram of a Ctenophore. After Chun. 



/., Mouth; S., sensory organ ; T. t tentacle cut short; Sff. t 

 pouch of tentacle ; C. , ciliated combs ; F. , funnel or central canal ; 

 SV., paragastric canal running parallel with stomodaeum; ., 

 other canals of the gut; V.^ one of the meridional canals, bear- 

 ing gonads, running under the bands of ciliated combs. 



