54 THE HYDROMEDUSAE 



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

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

 [Melicertum] ; Melicertidium, 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, = Ametmngia, Allm. ; Dicranocranna, Hkl. ; Toxorchis, Hkl. ; 

 Willeiia, Hkl.; Willsia (vulgo JrttKa, formerly classed here, but an Antlio- 

 inedusan), Forbes ; Proboscidactyla, Brandt ; Cladocanna, Hkl. FAMILY 3. 

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

 Gegenb., [? Campanularia + 1 Clytia] ; Obelia, Per. Lesueur, [Obelia] ; 

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

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

 M'Crady, [Clytia] ; Mitrocomella, Hkl. ; Phialidium, Leuck., = TJiaumantias 

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

 M'Crady ; Saphenia, Escli.; Eutimeta, Hkl. ; Eutimalphes, Hkl. ; Octor- 

 chidium, Hkl. ; Octorchis, Hkl. ; Octorchandra, Hkl.; Irenium, HkL ; Irene, 

 Esch. ; Tima, Esch., [Tima]. FAMILY 4. AEQUORIDAE. Genera Octo- 

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

 Halopsis, A. Agass. ; Aequorea, Per. Lea ; Rhegmatodes, A. Agass. ; Stomo- 

 brachium, Brandt ; Staurobrachium, Hkl. ; Mesonema, ~Escli., = Zygodactyla, 

 Brandt, [Zygodactyla] ; Polycanna, Hkl., 



(6). Hydroid Scheme. 



FAMILY 1. CAMPANULAEIIDAE. Genera Campanularia, Lamk., 

 \Thaumantias (pars)] ; Love'nella, Hincks [?] ; Obelia, Per. Les. [Obelia] ; 

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

 Lytoscyphus, Pictet [?] ; Gonothyraea, Allm. [S] ; Clytia, Lamx., [Eucojn' 

 (pars), + Epenthesis] ; Campanulina, v. Bened., = Laomedea, Lamx., [Phia- 

 lidium + Polycanna] ; Opercularella, Hincks [S] ; Calamphora, Allm. [S] ; 

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

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

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

 laria, Busk [?] ; Lafoea, Agass., [Laodice] ; Lictorella, Allm. [?] ; Cuspidellu, 

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

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

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

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

 Diphasia, L. Agass.; Tliuiaria, Flem. ; Desmoscyphus, Allm. ; Sertularella, 

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

 Dictyocladium, Allm. FAMILY 5. AGLAOPHENIIDAE (gonophores probably 

 sessile throughout). Genera Aglaophenia, Lamouroux ; Acanthocladium. 

 Allm. ; Lytocarpus, Kirchenp. ; Streptocaulus, Allm. ; Diplocheilus, 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. GRAM- 

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

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



