III. _C[oe]lenterata_ _Hydrozoa_ (Hydroids and Jelly-fish) _Leptomedusæ_ or _Campanulariæ_ Medusa form--_Eutima_, _Phyalidium_ (_Oceania_). Hydroid form--_Aglaophenia_, _Campanularia_, _Sertularia_, _Plumularia_, _Cellularia_, _Valkeria_, _Obelia_, _Clytia_. _Trachomedusæ_ _Geryonia_, _Lyriope_, _Aglaura_ _Narcomedusæ_ _Cunina_ _Anthomedusæ_ or _Tubulariæ_ Medusa form--_Thaumantias_, _Tiara_, _Turris_, _Sarsia_. Hydroid form--? Hydrocorallinæ _Siphonophora_ _Abyla_, _Praya_, _Diphyes_, _Eudoxia_, _Hippopodius._ _Scyphozoa_ (Jelly-fish) Stauromedusæ Peromedusæ _Cubomedusæ_ _Carybdia_ _Discomedusæ_ _Pelagia_, _Aurelia_, _Chrysaora_, _Rhizostoma_, _Cyanæa_, _Dianea_, _Mesonema_. _Actinozoa_ (Corals, Sea-fans, Sea-pens, Sea-anemones) Actinaria Madreporareia Antipatharia _Alcyonaria_ _Alcyonium_, _Gorgonia_, _Isis_, _Mopsea_ _Pennatulacea_ _Pennatula_, _Pteroides_, _Veretillum_, _Cavernularia._ _Funicularia_, _Renilla_, _Pavonaria_, _Stylobelemon_, _Umbellularia_, _Virgularia?_ _Ctenophora_ (Comb-jellies) _Cydippida_ _Pleurobranchia_. _Lobata_ _Mnemiopsis_, _Bolinopsis_, _Leucothea_ (_Eucharis_). _Cestida_ _Cestus_. _Beroida_ _Beroë._ IV. Platyhelminthes Turbellaria (Flat-worms) Trematodes (Parasitic flat-worms) Cestodes (Tape-worms) Nemertinea (Nemertines) V. Nemathelminthes Nematoda (Round worms) Gordiacea (Hair worms) Acanthocephala (Acanthocephalids) Chætognatha (Sagitta) VI. Trochelminthes Rotifera (Wheel animalcules) Gastrotricha (Chætonotus) Kinorhyncha (Echinoderes) VII. _Molluscoidea_ _Bryozoa_ (Corallines) Entoprocta _Ectoprocta_ _Membranipora_, _Scrupocellaria_, _Retepora?_ _Flustra?_ Brachiopoda (Lamp shells) Phoronidea (Phoronis) VIII. _Annulata_ Archiannelida (Primitive worms, including Dinophilus) _Chætopoda_ (True worms) _Polychæta_ _Chætopterus_, _Phyllochaetopterus_, _Telepsaris_, _Polynoë_, _Acholoë_, _Tomopteris_, _Odontosyllis_, _Lepidonotus_, _Pionosyllis_, _Phyllodoce_, _Heterocirrus_, _Polyopthalamus?_ _Oligochæta_ _Lumbricus_, _Photodrilus_, _Allolobophora_ (_Eisemia_), _Microscolex_, _Nonlea_, _Enchytræus_, _Octochætus_. Gephyrea (Sipunculus) Hirudinea (Leeches) Myzostomida (Myzostomus) IX. _Echinodermata_ Asteroidea (Star-fish) _Ophiuroidea_ (Brittle-stars) _Ophiurida_ _Ophiopsila_, _Amphiura_, _Ophiacantha_, _Ophiothrix_, _Ophionereis_. Euryalida Echinoidea (Sea urchins) Holothuroidea (Sea Cucumbers) Crinoidea (Feather-stars)