218 THE AUSTRALIAN HYDROMEDUS.E, 



ORDO, HYDROMEDUSX Cams, 1863. 



HYDROPHORAE. Huxley, 1856. 

 HYDROIDEA. Agassiz, 1862. 

 HYDROID^. Claus, 1876. 



THE POLYPCOLONIES. 



HYDROID ZOOPHITES. Hinks, 1868. (Old term.) 



THE MEDUSAE. 



CRASPEDOT^E. Gegenbaur, 1856. 

 CYCLONEUELE. Eiiner, 1878. 

 APHACELL^E. Haeckel, 1878. 

 CRASPEDOT^E. Haeckel, 1879. (1.) 



POLYPES WITHOUT GASTRAL FILAMENTS OFTEN IN COLO- 

 NIES, SOMETIMES WITH GREATLY TRANSFORMED GENERA- 

 TIVE OR DEFENSIVE PERSONS, AND CYCLONEUROUS MEDUSAE, 

 WITHOUT GASTRAL FILAMENTS. 



I.-SUBORDO HYDROPOLYPIN^E. Von 

 Lendenfeld, 1884. 



HYDROMEDUS^E GENERALLY FORMING COLONIES OF ALI- 

 MENTARY AND GENERATIVE PERSONS. THE TWOFUNCTIONS 

 MAY DEVOLVE ON ALL PERSONS ALIKE, OR BE EXECUTED BY 

 DIFFERENT ZOOIDS. RARELY SOLITARY. NOT PRODUCING 

 MEDUSA. THE BLASTOSTYLS OF THE HYDRO POLYPIN^E ARE 

 TRANSFORMED POLYPES AND NOT RUDIMENTARY MEDUSAE. 



( 1 . ) Other synonyms in the works referred to. 



