LIST OF THE WOOD-CUTS. xi 



151. Profile view, somewhat magnified, of HALOPSIS CRUCIATA 102 



" 152. Natural attitude of the same Medusa (Fig. 151) 102 



" 153. Abactinal view of ZYGODACTYLA GROEXLANDICA 104 



' 154. Profile view of Fig. 153, half natural size 104 



" 155. Portion of the circular tube . . . . . . . . . . .104 



" 156. Young Zygodactyla, greatly magnified ........ 105 



" 157. Profile view of ZYGODACTYLA CRASSA, somewhat reduced in size . . .106 



" 158. Quarter-disk of Zygodactyla crassa . . . . . . . . . 107 



" 159. Portion of the disk of ZYGODACTYLA CYAXEA, from the abactinal pole. (L. Ag.) 107 



" 159". CREMATOSTOMA FLAVA, in profile 109 



" 160. Portion of the disk of ^EQUOREA ALBIDA, from the abactinal pole . . . 110 



" 161. A natural attitude of zEquorea albida 110 



" 162. Magnified view of the marginal tube ........ Ill 



" 163. EIRENE CCERULEA. (L. Agassiz.) 112 



" 164. TIMA FORMOSA, half natural size 113 



" 165. Quarter of the disk, from the abactinal pole, natural size . . . . .113 



" 166. Digestive cavity and actinostome ......... 113 



" 167. Portion of the ovary . . . . . . . . . . . .114 



" 168. Magnified portion of the circular tube ........ 114 



" 169. Young Tima formosa, natural size . . . . . . . . . .114 



" 170. Digestive cavity of Fig. 169 114 



" 171. Young Planula; of Tima ........... 115 



" 172. Single Hydra of the tuft of a Tima Hydrarium, greatly magnified . . . 115 



" 173. Profile of EUTIMA LIMPIDA, reduced in size 116 



" 174. Quarter-disk of Fig. 1 73 . 116 



" 175. Magnified view of proboscis and genital organs . . . . . . .117 



" 176. Magnified portion of a part of the circular canal . . . . . . 117 



" 177. Magnified marginal capsule . . . . . . . . . . .117 



" 178. Magnified view of the rudimentary tentacles 117 



" 179. Profile view, somewhat magnified, of POLYORCHIS PENICILLATA . . .119 



" 180. Ovaries of one of the chymiferous tubes 119 



" 181. Section of bell ............. 120 



" 182. Part of disk of Fig. 1 79, seen from the abactinal pole . . . . 120 



" 183. Two of the marginal tentacles in a contracted state 120 



" 184. Adult Medusa of LAFCEA CALCARATA 122 



" 185. One of the ovaries and the actinostome . . . . . . . .123 



" 186. Actinostome, actinal view .......... 123 



187. Magnified view of a portion of the circular tube ... ... 123 



" 188. Actinostome and rudimentary ovaries, seen in profile . . . . . 123 



" 189. Different attitude of Medusa of Fig. 184 124 



" 1 90. Hydrarium of Lafoea calcarata .......... 1 24 



" 191. Reproductive calvcle . . . . . . . . . . . .125 



" 192. Medusa immediately after its escape from the reproductive calycle . . . 125 



" 193. Medusa somewhat more advanced, from the abactinal pole . . . . .125 



' 194. Young Medusa still further advanced than Fig. 193 126 



" 195. LAODICEA CELLULARIA 127 



" 196. One of the lips of the actinostome ......... 127 



" 197. GOXIONEMUS VERTENS, attached by its tentacles 129 



" 198. The same in motion, natural size 129 



" 199. Base of a contracted tentacle . 130 



" 200. A portion of the genital organs ......... 130 



" 201. One of the chymiferous tubes and half the digestive cavity . . . 130 



" 202. Profile of MELICERTUM CAMPANULA, natural size .... 131 



" 203. Profile view of a very young Melicertum campanula ...... 132 



" 204. Half the disk of the same, seen from the actinal pole ... 132 



" 205. Young Melicertum, having only four completely formed chymiferous tubes . .132 



" 20fi. Same, seen from the abactinal pole .133 



" 207. Magnified view of the two chymiferous tubes and genital glands . . . .133 



" 208. Mode of carrying the lips of actinostome ..... . 133 



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