THE HYDROMEDUSAE 55 



Allm. [?]. Family 10. Plumulariidak (gonoijliores probably sessile 

 throughout). Genera — Flumulariu, Laiiik. pai-s. ; Antennularia, 

 Lauik. ; Acanthelht, Allm. ; Schizotricha, Alhu. ; Scinrella, Allm. ; 

 Polijplumaria, G. O.Sal's; H ct eroplon, AWm. ; Xemertesiu. Family 11. 

 Calicahpidae. Genera — Calicarpa [?] ; Hippurellu, Allm. [?]. Family 12. 

 HvDROCER^vTixiDAE. Geuus — ClathrozooH, Spencer [?]. Incertae sedis 

 — Trichydra, S. Wright [?] ; Coppinia, Hassall [?]. 



Order 3. Trachomedusae. (For detiuitiun, ^to p. 30.) 



Family 1. Pet.\.sidae. Genera — Fetastis, Hkl. ; Dipetasm, Hkl. ; 

 Fetasata, Hkl. ; Fetitchnidii, Hkl. ; Aylauropsis, F. Miill. ; Gossea, L. Agass. ; 

 Olindias, F. Miill. Family 2. Trachynemidae. Genera — Trachjnewa, 

 Gegenb. ; Marmuuenia, Hkl. ; lihupcdonema, Gegenb. ; Fectyllis, Hkl. ; 

 Fectis, Hkl. ; Fectanfln'.i, Hkl. ; Homoeonema, Maas. ; (?) Fantachorjon, Maas. 

 Family 3. Aglauridae. Genera — Aijlantha, Hkl. ; Aglaura, Per. Le.s. ; 

 Agliscra, Hkl. ; Stauraylaiira, Hkl. ; Fersa, M'Crady. Family 4. Gery- 

 onidae. Genera — Liriantha, Hkl., = Liriope, Less. ; Glossoco7ius, Hkl. ; 

 Glossocodon, Hkl. ; Geryones, Hkl. ; Geryonia, Per. Les. ; Gurmaris, Hkl. ; 

 Carmarina, Hkl. 



Order 4. Narcomedusae. (For definition, see p. 33.) 



Family 1. Cdn^vnthidae. Genera — Cunantha,Iikl.; Cunarcha,Hk].; 

 Cunoctantha, Hkl. ; Cunoctona, Hkl. ; Cunina, Esch. ; Giinissa, Hkl. 

 Family 2. Pegaxthidae. Genera — Folycolpa, Hkl. ; Folyxenia, E^ch. ; 

 Ferjasia, Per. Les. ; Fegantha, Hkl. Family 3. Aeginidae. Genera — 

 Aegina, Esch. ; Aeginella, Hkl. ; Aeijineta, Gegenb. ; Aerjinopsis, Brandt ; 

 Aeginura, Hkl. ; Aeginodiscus, Hkl. ; Aeginodorus, Hkl. ; Aeginorhodus, 

 Hkl. Family 4. Solsiaridae. Genera — Sobaissus, Hkl. ; Solmundus, 

 Hkl. ; Solmundella, Hkl. ; Solmoneta, Hkl. ; Solmaris, Hkl. 



Order 5. Hydrocorallinae. (For definition, see p. 35.) 



Family 1. Millkporidae. Genus — Millepora, Linn. Family 2. 

 Styla8TERIDae. Genera — Sporadopora, Moseley ; Fliohothru.% Pourtal. ; 

 'Errina, Gvax ; Distichopora, Lamk. ; Labiopora, Moseley ; Spinvpord, 

 Moseley ; Allopora, Elirenb. ; Stylaster, Gray ; Stenohelia, S. Kent ; 

 Conopora, Moseley ; Cryptohelia, M. E. and H. ; Axfylus, Moseley. 



Order G. Siphonophora. (For definition, .see p. 38.) 

 Sub-Order 1. Disconectae. 



Definition. — Siphonophora with an apical chanibeied i)ncuniatophore, 

 without nectophores or bi'acts. The individuals are confined to the lowi'r 

 surface of the pneumatophore, and are a single central gastrozooid, 

 surrounded by concentric giixlles of l^lastostyles and dactylozooids. 



Family 1. Discalidae. Genera — Dincalia, Hkl. ; Disconalia, Hkl. 



