54 THE HYDROMEDUSAE 



exploded into numerous genera ; Staurostoma, Hkl. ; Laodice, Less., 

 [Lafoea] ; Melicertella, Hkl. ; Melicertissa, Hkl. ; Melicertum, A. Agasw. 

 [Melicertum] ; Melicertidihm, Hkl.; Orchistoma, Hkl.; Halmomises, v. 

 Kenn. FAMILY 2. CANNOTIDAE. Genera Staurodiscus, HkL ; Gonynema, A. 

 Agass. ; Ptychogena, A. Agass. ; Staurophora, Brandt ; Polyorchis, A. Agass. ; 

 Cannota, HkL ; Dyscannota, Hkl. ; Berenice, Per. et Lesueur ; Dipleurosoma, 

 Boeck, = Ametrangia, Allm. ; Dicranocranna, Hkl. ; Toxorchis, Hkl. ; 

 Willetta, HkL; Willsia (vulgo jyillia, formerly classed here, but an Antho- 

 medusan), Forbes ; Proboscidactyla, Brandt ; Cladocanna, HkL FAMILY 3. 

 EUCOPIDAE. Genera Eucopium, HkL, [Clytia] ; Saphenella, HkL ; Eucope, 

 Gegenb., [? Campanularia + ? Clytia] ; Obelia, Per. Lesueur, [Ota'Jm] ; 

 Tiaropsis, L. Agass. ; Euchilota, M'Crady, = Thaumantias (pars), = Laodice 

 (pars); Phialum, HkL; Phialis, HkL; Mitrocomium, HkL; Epenthesis, 

 M'Crady, [C^^'a] ; Mitrocomella, Hkl. ; Phialidium, Leuck., = Thaumantias 

 (pars.), [CtompcMwfona] ; Mitrocoma, HkL ; Eutimium, Hkl. ; Eutima, 

 M'Crady; Saphenia, Esch.; Eutimeta, HkL; Eutimalphes, HkL; Oc<or- 

 chidium, HkL ; Octorchis, HkL ; Octorchandra, HkL; Irenium, HkL ; /raie, 

 Esch. ; Tiwa, Esch., [Tma]. FAMILY 4. AEQUORIDAE. Genera Oc<o- 

 canna, HkL ; Zygocanna, Hkl. ; Zygocannota, Hkl. ; Zyyocannula, Hkl. ; 

 Halopsis, A. Agass. ; ^e^Morea, Pdr. Les. ; Rhegmatodes, A. Agass. ; Stomo- 

 brachium, Brandt ; Staurobrachium, Hkl. ; Mesonema, Esch., = Zygodactyla, 

 Brandt, [Zygodactyla] ; Polycanna, HkL, [C7ampanit{t9ia]. 



(6). Hydroid Scheme. 



FAMILY 1. CAMPANULARIIDAE. Genera Campanularia, Lamk., 

 [T/iawmanh'aa (pars)] ; Love'nella, Hincks [?] ; O&e/ta, Pdr. Les. [06e/t'a] ; 

 Tliyroscyphus, Allm. [?] ; Hypanthea, Allm. [S] ; Calycella, Hincks [S] ; 

 Lytoscyphus, Pictet [?] ; Gonothyraea, Allm. [S] ; C7>//w, Lamx., [JE"coj^; 

 (pars), + Epenthesis] ; Campanulina, v. Bened., ^Lamnedea, Lamx., [P/M- 

 lidium + Po/j/ca?i7ia] ; Opercularella, Hincks [S] ; Calamphora, Allm. [S] ; 

 Hebella, Allm. [?] ; Halisiphonia, Allm. [S] ; Zygodactyla, Brandt, [Zygu- 

 dactyla Mesonema] ; Leptoscyphus, Allm. [?] ; Obelaria, Hartlaub [S]. 

 FAMILY 2. PERISIPHONIIDAE. Genera Perisiphonia, Allm. [?] ; Crypto- 

 laria, Busk [?] ; Lafoea, Agass., [Laot/tce] ; Lictorella, Allm. [?] ; Cuspidellu, 

 Hincks [?]; Filellum, Hincks [?]. FAMILY 3. HALECIIDAE. Genera 

 Halecium, Oken [S] ; Diplocyathus, Allm. [?] ; Ophiodes, Hincks [S] ; 

 Hydrella [S] ; Haloikema, Bourne [?]. FAMILY 4. SERTULARIIDAK 

 (gonophores sessile throughout). Genera Sertularia, Linn. pars. ; 

 Diphasia, L. Agasa; Thuiaria, Flem. ; Desmoscyphus, Allm. ; Sertularella, 

 Gray; Hydrallmania, Hincks; Hypopyxis, Allm.; Staurotheca, Allm.; 

 Dictyocladium, Allm. FAMILY 5. AGLAOPHENIIDAE (gonophores probably 

 sessile throughout). Genera Aglaophenia, Lamouroux ; Acanthocladiwn . 

 Allm. ; Lytocarpus, Kirchenp. ; Streptocaulus, Allm. ; Diplocheilua, Allm. ; 

 Cladocarpus, Allm. FAMILY 6. HALICORNARIIDAE (gonophores probably 

 sessile throughout). Genera Halicornaria, Busk, pars. ; Azygoplon, Allm. 

 FAMILY 7. IDIIDAE. Genus Idia, Lamouroux [S} FAMILY 8. GRA^I- 

 MARIIDAE. Genus Grammaria, Stimps., = (?) Salacia, Lamouroux [?]. 

 FAMILY 9. SYNTHECIDAE. Genera Synthecium, Allm. [?] ; Thecocladium, 



