CLASSIFICATIONS OF ZOOPHYTES. 75 



pierced with oscula and numerous pores, but without mouths or 

 distinct individual animals, always adherent, and composed of a fi- 

 bro-gelatinous substance, intermixed or not with calcareous or si- 

 liceous spicula, with internal buds or gemmules not localized. 

 This embraces the sponges only, divided into the following- genera — 

 Alcyonellum, Spongia, Calcispongia, Halispongia, Spongilla, Geo- 

 dia, Cseloptychium, Siphonia, Myrmeciura, Scyphia, Eudea, Hallir- 

 hoa, Hippelimus, Cnenimidium, Lymnorea, Chenendopora, Tragos, 

 Manon, Jerea, Tethium. 



PSEUDOZOA. 



Organized bodies not animal but vegetable. 



Class I. Calciphytje. 

 Family 1 . Corallince — Corallina, Jania, and Flabellaria are British 



genera. 

 Family 2. Fucoidece — of which there are no native examples. 



When some years since I planned this history of our native 

 zoophytes these were all the classifications that the books ac- 

 cessible to me furnished for my purpose, but their imperfections 

 and incongruities had been made so apparent in the progress of 

 discovery, that I was induced to devise that one for my guid- 

 ance which is here adopted. This method, drawn up with- 

 out any foreknowledge of it, is in its main features similar to that 

 proposed by Audouin and Milne-Edwards ;* and from this co- 

 incidence I feel the more assured that it will be found in closer 

 harmony with the structure of the animals than any of its pre- 

 decessors, and not less difficult in its practical applications. It 

 is then proposed to divide the British zoophytes in the first 

 place into the following sub-classes and orders, whose families 

 and genera will be found characterized under their respective 

 heads. 



Sub-Class I. RADIATED ZOOPHYTES. 



Body contractile in every part, symmetrical ; mouth and anus one ; 

 gemmiparous and oviparous. 

 Order I. Hydroida. Polypes compound, rarely single and naked, 



* Recherches pour servir a I'Histoire Nat. du Littoral de la France, Vol. i. 

 p. 73—6,— Ann. des Sciences Nat. Part. Zool. vi. 1.5, 16 ; and Lam. Anira. s. 

 Vert. ii. 104. 2de edit. Paris, 1836. 



