Outlines of zoology . ified medusoid per-sons (medusomes), withmuch division of labour. Physalia (Portugueseman-of-war), Diphyes, Vel-ella, Porpita. IncertcE sedis. Grapto-lites.—Extinct unattachedcolonies with a rod-likeaxis found in UpperCambrian, Ordovician, andSilurian systems. Thecolony is usually linear,and consists of cup-shapedhydrothecee borne on one,two, or four sides of thesolid axis {virgula). Eachopens into a commonmedian canal. At theproximal free end thereis a minute triangularor dagger - shaped body— the sicula — which re-presents the embryonicskeleton. Some repro-ductive bodie
Outlines of zoology . ified medusoid per-sons (medusomes), withmuch division of labour. Physalia (Portugueseman-of-war), Diphyes, Vel-ella, Porpita. IncertcE sedis. Grapto-lites.—Extinct unattachedcolonies with a rod-likeaxis found in UpperCambrian, Ordovician, andSilurian systems. Thecolony is usually linear,and consists of cup-shapedhydrothecee borne on one,two, or four sides of thesolid axis {virgula). Eachopens into a commonmedian canal. At theproximal free end thereis a minute triangularor dagger - shaped body— the sicula — which re-presents the embryonicskeleton. Some repro-ductive bodies or gon- —,„ /-• 1 ? tt j -j angia have been found. Fig. animals were prob- After AUman. ably free - swimming in H., Hydrotheca or polyp-cup; HY., hy- muddy seas, and of a dranth, or polyp-head; G.,,gonotheca, tr„.4,i™„,1„<„n ^„t„,^ enclosing a reproductive polyp producing Hydromedusan nature. medusoffl buds; M., a liberated medu- soid ; ST,j basal Class II. ScYPHOMEDUSiE (= Acraspeda) Jelly-fish with gastric filaments, sub-genital pits, and no velum— (1) Lucernarise.—Sedentary forms. Lucemaria, Haliclystus, and Depastrum. (2) Discomedusse.—Active forms, often with complicated life history. Aurelia, Pelagia, Cyanea, Rhizostoma. 74 PHYLUM CCELENTERA. (3) Cubomedusse.—Forms with broad pseudo-velum, and other peculiar features. Charybdea. (4) Peromedusas.—Forms with four inter-radial tentaculocysts only. Pericolfa. Class III. Anthozoa ( = Actinozoa) Polypoid forms with well-developed gullet and septa, and circumoraltentacles,(i) Zoantharia or Hexacoralla. (a) Actiniaria. Sea-anemones. Actinia, Anevwnia, Tealia, Cerianthus.{b) Madreporaria. Stone or reef corals. Asir(ra^ Madrepora^ Fungia, M(Bandrina,(ir) Antipatharia. Horny black corals. Antifathes.(2) Alcyonaria or Octocoralla. Alcyonium (Dead-mens-fingers), Tubipora (Organ-pipecoral), Corallhim (Red coral), Gorgonia, Pennatula (Sea-pen), Monoxenia (n
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
