LIST OF ILLUSTRATIONS 



46 Bougainvillea 104 



47 Physalia 106 



48 Halistemma 108 



49 Aurelia, ventral view . . . no 



50 ,, development ... 112 



51 Tessera 114 



52 Tealia 116 



53 Diagrammatic sections of a 



Sea-anemone 117 



54 Corallium 118 



55 Alcyonium 119 



56 Tubipora 120 



57 Pennatula . 121 



58 Structure of a simple coral 122 



59 Astnea 123 



60 Dendrophyllia and Madre- 



pora 124 



6 1 Hormiphora 126 



62 ,, section of branch 



of tentacle 127 



63 Liver-fluke 130 



64 ,, internal organisa- 



tion 131 



65 ,, development . . 134 



66 Trematodes 136 



67 Diagram of Triclad Turbel- 



larian 137 



68 Tapeworm 139 



69 ,, head .... 140 



70 ,, proglottis . . . 141 



71 ,, development . 142 



72 Toenia echinococcus . . . 144 



73 Diagram of Nemertine . . 146 



74 Tetrastemma 147 



75 Ascaris 150 



76 ,, dissection of female 151 



77 Nervous system of Nematoda 152 



78 Ascaris, dissection of male 



organs 153 



79 Trichina 155 



80 Starfish 158 



8 1 ,, vertical section of arm 161 



82 ,, diagramatic sections 164 



83 ,, digestive system . . 165 



84 ,, am bulacral system . 166 



85 ,, dorsal surface . . . 167 



86 ,, ventral surface . . 168 



87 Ophioglypha 169 



88 Strongylocentrotus . , . 171 



89 Sea-urchin, corona ... 172 



90 ,, apical disc . . 172 



91 Cucumaria 173 



92 Antedon 175 



93 Metacrinus 176 



94 Brachionus 179 



95 Bugula 182 



96 Plumatella 183 



97 Pedicellina 184 



98 Magellania, shell .... 185 



99 ,, anatomy . . 186 



100 Nereis 189 



101 parapodium . . . 190 



102 ,, setae 191 



103 ,, anatomy 193 



104 ,, transverse section . 194 



105 ,, nervous system . . 196 



106 Terebella 198 



107 Serpulae 199 



1 08 Eupomatus, development 



of trochosphere . . . 200 



109 Earthworm 201 



no ,, setee . . . 202 



in Leech 204 



112 ,, dissection .... 206 



113 ,, diagram of blood- 



vessels .... 208 



114 Crayfish 213 



115 ,, appendages . . . 216 



116 ,, dissection .... 220 



117 gills 223 



