318 



M. BEDOT 



Gen. Hydra Linné 



H. carnea Agassiz, L, 



H. gracilis Agassiz, L. 



H. kexactineUa Lendenfeld 

 H . viridis 



var. bakeri Marshall 



H. viridis sec. Jickeli 



Gen. Hydractinia Beneden 



H. borealis Bergh 



H. (Oorhiza) borealis Bergh 



H. carica Bergh 



Gen . Hydrichthys Fewkes 



H. mirus Fewkes 



Gen. Hypanthea Allman 



H. aggregata Allman 



H. atlantica Marktanner 



H. georgiana Pfeffer 



H. hemisphaerica Allman 



Gen. Hypopyxis Allman 



H. labrosa Allman 



Gen. Isocola Jickeli 



I. disticha sec. Jickeli 



I. frutescens sec. Jickeli 



I. gaymardi sec. Jickeli 



I. pinnata 



Gen. Kirchenpaueria 



Gen. Lafoea 



L. costata 

 L. cylindrica 

 L. elangans 

 L. gigas 

 L. gracillima 

 L. halecioides 

 L. parasitica 

 F^. pygmaea 



sec. Jickeli 



Jickeli 



Lamouroux 



(Bale) 



Lendenfeld 



Fewkes 



Pieper 



HiNCKS 



Allman 



ClAMICIAN 

 HiNCKS 



1746 

 18S1 (a) 

 1851 (a) 

 1886 (a) 



1882 



1883 



1841 



1887 



1887 



1887 



1887 



1887 



1876 (c) 



1888 



1890 



1889 



1888 



1888 



1888 



1883 



1883 



1883 



1883 



1883 



1883 



1821 



1884 



1885 (b) 



1881 (a) 



1884 



1874 (a) 



1871 



1880 



1868 



=: Hydra oUgaclis. 

 = Hydra viridis. 



= ? Hydra oligactis.. 



= Oorhiza borealis. 

 = Oorhiza borealis.. 



Supp. = Plumularia.. 



= Plumularia dis- 

 ticha. 



= Phimularia fru- 

 tescens . 



= Plumularia setacea 

 var. gaimardi. 



= Plumularia pin- 

 nata. 



Supp. ^ Diplocheilus. 



= Rebella cylindrica^ 



: Lafoea fruticosa. 

 : Lafoea pinnata. 

 : H ebella paras itica . 

 Halisiphonia pyg- 

 maea. 



