THE HYDROMEDUSAE 53 



FAMILY 4. CLADONEMIDAE. Genera Pteronema (? a Codonid), Hkl. ; Zan- 

 clea, Gegenb. ; Gemmaria, M'Crady [Gemmaria] ; Eleutheria, Quatref., 

 [Clavatella] ; Ctenaria, Hkl. ; Dendronema, Hkl. ; Cladonema, Duj., 

 [Cladonema = Stauridium] (? a Codonid); WiUtia, Forbes, [Lar]. 



(6). Hydroid Scheme. 



FAMILY 1. CLAVIDAE. Genera Clava, Gmel. [S] ; Ehizogeton, A. Ag. 

 [S] ; Cordylophora, Allm. [S] ; Tubiclava, Allm. [S] ; Merona, Norm. [S]. 

 FAMILY 2. TURRIDAE. Genera Turris, Less., = Clavula, Str. Wright, 

 [Turris]; Camjmniclava, Allm. [S] ; Corydendrium, van Ben. [?] ; Dendro- 

 dava, Weismann, [Dendroclav a] (? Pandaeid). FAMILY 3. CORYNIDAE. 

 Genera Coryne, Gartn. [S] ; Actinoyonium, Allm. [S] ; Syncoryne, 

 Ehrenb. (pars.), [Godonium + Sarsia + Syndictyon] ; Gymnocoryne, Hincks [?] ; 

 Corynetes, M'Crady, [Corynetes Halocaris] ; Gemmaria, M'Crady, [Gem- 

 maria] ; Sphaerocoryne, Pictet [?]. FAMILY 4. BOUGAINVILLIIDAE. Genera 

 Bougainvillea, Less., [Margelis + Hippocrene] Perigonimus, M. Sare., 

 [Dinema + ? Amphinema] ; Bimeria, S. Wright [S] ; Dicoryne, Allm. [S] ; 

 Stylactis, Allm. [S] ; Garveia, S. Wright [S] ; Wrightia, Allm., = Atractylis, 

 S. Wright [S] ; Hydranthea, Hincks [S] ; Heterocordyle, Allm. [S]; Cionistes, 

 S. Wright [S] ; Stylactella, Hkl. [?]. FAMILY 5. EUDENDRIIDAE. Genus 

 Eudendrium, Ehrenb. pars. [S]. FAMILY 6. PEKNARIIDAE. Genera 

 Pennaria, Goldf., [Globiceps] ; Stauridium, Duj., [Cladonema] ; Halocordyle, 

 Allm., [Halocordyle] ; Vorticlava, Alder [?] ; Heterostephanus, Allm., [Hetero- 

 stephanus]; Acharadria, S. Wright [?]; Tiarella [Tiarella]. FAMILY 7. 

 CLAVATELLIDAE. Genus Clavatella, Hincks, [Eleutheria], FAMILY 8. 

 CLADOCORYNIDAE. Genus Cladocoryne, Rotch [?]. FAMILY 9. TUBU- 

 LARIIDAE. Genera Tubularia, Linn. pars. [S] ; Ectopleura, A. Agass., 

 [Ectopleura] FAMILY 10. MYRIOTHELIDAE. Genus Myriothela, M. Sars 

 [S]. FAMILY 11. HYDRACTINIIDAE. Genus Hydractinia, v. Bened. [S]. 

 FAMILY 12. PODOCORYNIDAE. Genera Podocoryne, M. Sars, pars., [Cytaeis 

 + Cubogaster + Dysmorphosa + Lizzia (pars.)] ; Corynopsis, Allm., [Corynop- 

 sis\. FAMILY 13. CORYMORPHIDAE. Genera Corymorpha, M. Sars, pars., 

 \Steenstrupia + Hybocodon = Amphicodon <= Uiplura + Amalthaea] ; Hala- 

 tractus, Allm., [Euphysa~\. FAMILY 14. MONOCAULIDAE. Genus Mono- 

 caulus, Allm. [S]. FAMILY 15. HYDROLARIDAE. Genus Lar, Gosse, 

 [Willsia, vulgo Willia\. FAMILY 16. MONOBRACHIIDAE. Genus Mono- 

 brachium, Merej. [?]. [FAMILY SPONGICOLIDAE. Genera (Spongicola, 

 F. E. Schulze, = Stephanoscyphus, Allm., is probably a Scyphistoma).] 

 FAMILY 17. HYDRIDAE. Genus Hydra, Linn. [S]. FAMILY 18. MYRIOXE- 

 MIDAE. Genus Myrionema, Pictet. FAMILY 19. CERATELLADAE. Genera 

 Ceratella, Gray [S] ; Dehitella, Gray [S]. INCERTAE SEDIS Protohydra, 

 Greef; Microhydra, Potts.; Haleremita, Schaudinn ; Acaulis, Stimps. 



ORDER 2. Leptomedusae = Calyptoblastea. (For definition, see p. 22.) 

 (a). Medusoid Scheme. 



FAMILY 1. THAUMANTIIDAE. Genera Tetranema, HkL ; Dissonema, 

 Hkl. ; Octonema, Hkl. ; Thaumantias, Esch., [Campanularia, etc.] has 



