X LIST OF THE WOOD-CUTS. 



Fig. 96. Young Medusa of Oceania lan'GUIDA, immediately after escaping from the re- 

 productive calycle ,72 



*' 97. The same, seen from the actinal pole ......... 72 



" 98. Somewhat more advanced Medusa 72 



" 99. Quarter of the disk of a still more advanced Oceania 72 



" 100. Adult Oceania languida, natural size 73 



" 101. Magnified view of an ovary 73 



" 102. Peculiar attitude sometimes assumed by the MedusEe 73 



" 103. One of the four lips of the actinostome of Oceajs^ia gregaria ... 74 



" 104. EUCHEILOTA VEXTRICULARIS 74 



" 105. More magnified view of a quarter of the disk ....... 75 



" 106. EUCHEILOTA DUODECIMALIS 75 



" 107. Junction of one of the chymiferous tubes with the circular tube ... 76 



" 107". Female Medusa of Eucheilota duodecimalis 76 



" 108. Clytia bicophora, immediately after its escape from the reproductive calycle 78 



" 109. A somewhat older Medusa . 78 



" 110. An adult Medusa, measuring a quarter of an inch ...... 78 



" 111. Sterile Hydra and reproductive calycle, seen from the broad side .... 79 



" 112. Reproductive calycle of Platypyxis CYLixDRiCA, seen from the broad side . 80 



" 113. The same, seen from the narrow side ......... 80 



" 114. Sterile Hydra of Platypyxis cylindrica. (L. Agassiz.) 80 



" 115. A EucoPE DiAPHANA, seen in profile, just after its escape from the reproductive 



calycle 83 



" 116. Quarter of the disk of the same, seen from above . 83 



" 117. A more advanced Eucope, with the second set of tentacles .... 83 



" 118. An adult Eucope, seen in profile 84 



" 119. Quai'ter of Fig. 118, more magnified 84 



" 120. Magnified view of the circular tube of a young Eucope 84 



" 121. Spermaries of Eucope 84 



" 122. Female genital organs 84 



" 123. Proboscis of an aciult Medusa 85 



" 124. Hydrarium of Eucope diaphana, natural size ........ 85 



" 125. Magnified view of a sterile Hydra and reproductive calycle ..... 85 



" 126. Magnified view of part of main stem of Eucope POLYGENA 87 



" 127. Eucope pyriformis, seen in profile 88 



" 128. Quarter-disk of same Medusa . 88 



"129. Portion of a Hydrarium of Fig. 127 88 



" 130. Quarter-disk of Eucope articulata 89 



" 131. Portion of a Hydrarium of Eucope articulata 89 



"132. Hydrarium of Eucope FUSiFORMis 90 



" 133. Quarter-disk of the IMedusa of Fig. 132 90 



" 134. Portion of stem of Hydrarium of Obelia COMMISSURALIS 91 



" 135. Quarter-diskof the Medusa of Fig. 134 92 



" 136. Profile view, natural size, of Rhegmatodes tenuis 95 



" 137. Quarter-disk of Fig. 136, seen from the actinal side 96 



" 138. Magnified portion of the circular canal 96 



" 139. Rhegmatodes floridaxus, natural size. (L. Agassiz.) . . . . 97 



" 140. Actinostome of Stomobrachium textaculatum, magnified .... 98 



" 141. Stomobrachium tentaculatum, seen from the abactinal pole, natured size . . 98 



" 142. Same as Fig. 141, seen in profile 99 



" 143. Portion of the disk of Halopsi.s ocellata, seen from the abactinal pole, some- 

 what reduced 100 



" 144. Cavity from which the ch\Tniferous tubes radiate 100 



" 145. Profile, natural size, of Halopsis ocellata 100 



" 146. Magnified part of circular tube . 101 



" 147. Magnified view of one of the eyes . ........ 101 



" 148. Young Halopsis ocellata, natural size • • 101 



" 149. Young Halopsis ocellata, one fifth of an inch in height 101 



" 150. Magnified portion of circular tube of Fig. 149 ....... 101 



