LIST OF ILLUSTRATIONS xix 



FKi 



86. Tentacle of Eucopella 



87. Obelia, medusa 



88. Diagram of medusa . ....... 



89. Derivation of medusa from polype . . . 127 



90. Projections of polype and medusa .... 



91. Development of zoophyte . ..... 130 



92. Bougainvillea raniosa . . . 134 



93. Various forms of Leptolinne . . 135 



94. Hydra . . . 13 



95. Protohydra leuckartii .... ... 137 



96. Various forms of leptoliiie Medusse ..... . 139 



97. Diagram illustrating formation of sporosac by degeneration of 



medusa ............. 140 



98. Early development of Eucope . 141 



99. Two Trachymedusse . . 142 



100. Two Narcomeduste ........ . 143 



101. yEginura, tentaculocyst . ... . . 143 



102. Larva of yEginopsis ... . 144 



103. Millepora alcicornis, skeleton ... . 145 



104. Millepora, diagram of structure ... . . 14(> 



105. Stylaster sanguineus, skeleton ... . 147 



106. Halistemma tergestinum ....... . . 148 



107. Diagram of a Siphonophore .... . 150 



108. Development of Halistemma . . . 151 



109. Physalia . .152 



110. Diphyes campanulata ... . 153 



111. Porpita pacifica ........ . 154 



112. Graptolites . . 155 



113. Aurelia aurita, dorsal and ventral views . . . 157 



114. ,, ,, side view and vertical section ..... 159 



115. ,, ,, portion of umbrella with tentaculocyst . . . 160 



116. ,, ,, development .... . . 162 



117. Tessera princeps . ..... . . 165 



118. Lucernaria ... .... 166 



119. Pericolpa quadrigata . . . . 167 



120. Charybttfea marsupialis . ... 168 



121. Nausithoe . . . 169 



122. Pilemapulmo . . 170 



123. Pelagia noctiluca, development ...... .171 



124. Tealia crassicornis, dissection and transverse section . 173 



125. Diagrammatic sections of Sea-anemone . . . . 175 



126. Tealia crassicornis, section of tentacle .... . 1 77 



127. Nematocysts of Sagartia ........ . 177 



128. Section of mesenteric filament of Sagartia ... . 178 



129. Transverse sections of embryos of Actinia .... . 180 



130. Zoanthus sociatus ....... . . 184 



131. Hartea elegans ....'. .... . -184 



132. Corallium rubrum ........... 185 



133. Astrsea pallida . . . 185 



I -1 



