LIST OF ILLUSTRATIONS xix 



PACK 



86. Tentacle of Eucopella .... 124 



87. Obelia, medusa 125 



88. Diagram of medusa 12fr 



89. Derivation of medusa from polype 127 



90. Projections of polype and medusa 128 



91. Development of zoophyte 130 



92. Bougainvillea ramosa 134 



93. Various forms of Leptolinre ... 135 



94. Hydra . 13G 



95. Protohydra leuckartii 137 



96. Various forms of leptoline Medusae 13i> 



97. Diagram illustrating formation of sporosac by degeneration of 



medusa 140 



98. Early development of Eucope 141 



99. Two Trachymedusse . 142 



100. Two Narcomedusai 143- 



101. ^Eginura, tentaculocyst 143- 



102. Larva of JEginopsis 144 



103. Millepora alcicornis, skeleton 145 



104. Millepora, diagram of structure 146 



105. Stylaster aanguineus, skeleton . . 147 



106. Halistemma tergestinum 148 



107. Diagram of a Siphoiiophore . . . 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 quadriga ta 167 



120. Charybdrea marsupialis 168 



121. Nausithbe 169 



122. Pilemapulmo 170 



123. Pelagia iioctiluca, development 171 



124. Tealia crassicornis, dissection and transverse section . . . 173 



125. Diagrammatic sections of Sea-anemone 175 



126. Tealia crassicornis, section of tentacle 177 



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. Astnea pallida 185 



b 2 



