Echinoderms, 91 Echinoids, 101 Embryology of Astracanthion, 124 '' '' Ctenophoræ, 34 '' '' Echinoderms, 123 '' '' Ophiurans, 135 '' '' Sea-urchins, 130 '' '' Star-fishes, 124 Eucope diaphana, 50 Halcampa albida, 16 Halcyonium carneum, 19 Halcyonoids, 19 Haliclystus auricula, 46 Hippasteria phrygiana, 113 Holothurians, 95 Hybocodon prolifer, 74 Hydractinia polyclina, 73 Hydroids, 49 Idyia roseola, 32 Lafoea cornuta, 67 Laomedea amphora, 65 Lucernaria, 46 Madreporians, 16 Melicertum campanula, 63 Metridium marginatum, 7 Millepora alcicornis, 22 Mode of catching Jelly-fishes, 85 Nanomia cara, 76 Oceania languida, 53 Ophiurans, 115 Ophiopholis bellis, 115 Pentacrinus, 121 Pentacta frondosa, 99 Pleurobrachia rhododactyla, 27 Polyps, 5 Ptychogena lactea, 86 Physalia Arethusa, 83 Radiates, 1 Rhodactinia Davisii, 13 Sarsia, 68 Sea-urchin, 101 Sertularians, 66 Solaster endeca, 114 Star-fishes, 108 Synapta tenuis, 95 Systematic Table, 152 Tima formosa, 60 Toxopneustes drobachiensis, 101 Trachynema digitale, 45 Tubularia Couthouyi, 72 Tubularians, 67 Turris vesicaria, 69 Velella mutica, 84 Zygodactyla groenlandica, 57 THE END. ___________________________________________________________ Cambridge: Stereotyped and Printed by Welch, Bigelow, & Co. * * * * * Transcriber's Notes