LIST OF THE WOOD-CUTS. ix 



Fig. 42. Fig. 43, seen from above ... 30 



" 43. Fig. 42, seen from the broad side ..... . .30 



" 44. Pleurobrachia, immediately before the escape from the egg . . 31 



" 45. F!g. 44, somewhat less magnified, to show the relative size of the egg-case and the 



embryo ...... ..... 31 



" 46. Fig. 44, seen from the actinal pole . . . ..... 32 



' 47. Pleurobrachia swimming freely about, seen from the broad side . 32 



" 48. Somewhat less advanced than Fig. 47, showing the lateral tubes from the narrow 



side, as a prolongation of the ambulacra! cavity . . 33 



" 49. Pleurobrachia about in state of Fig. 47, seen from the actinal pole . . . .33 



" 50. Adult Pleurobrachia, natural size, from broad and narrow side . 33 



" 51. Adult Pleurobrachia in a natural attitude, natural size . . 33 



" 52. Young IDYIA ROSEOLA, seen from the narrow side . 36 



" 53. Fig. 52, seen from the abactinal pole ......... 36 



" 54. Young Idyia, with distinct ambulacral tubes, seen from the narrow side . 36 



" 55. Fig. 54, seen from the abactinal pole . . . . . . . . .37 



" 56. Somewhat more advanced than Fig. 54, seen from the broad side . 37 



" 57. The long chymiferous tubes extend to the level of the actinostome . .37 



" 58. The long chymiferous tubes have united with the lateral tubes ; first trace of the 



ramifications of the long tubes . . . . . . . . .37 



" 59. The short ambulacra have nearly united with the circular tube . . . . 37 



" 60. The circuit is now complete between the short and long ambulacra ; the spurs or 



ramifications of the chymiferous tubes are numerous, resembling somewhat 



those of the adult ....... . 37 



" 61. Fig. 57, seen from the abactinal pole ... 38 



" 62. Adult Idyia, reduced in size one half. (L. Agassiz.) ...... 38 



" 63. IDYOPSIS CLARKII, seen from the broad side. (L. Agassiz.) ..... 39 



" 64. Fig. 63, seen from the abactinal pole. (L. Agassiz.) 39 



" 65. Profile view of AURELIA FLAVIDULA, much reduced. (L. Agassiz.) . . .42 



" 66. Abactinal view of Aurelia navidula. (L. Agassiz.) ...... 42 



" 67. CYAXEA ARCTIC A, very much reduced. (L. Agassiz.) . . 45 



" 68. PELAGIA CYAXELLA. (L. Agassiz.) 47 



" 69. DACTYLOMETRA QUIXQUECIRRA, reduced about one fourth ... .48 



" 70. Profile view of CAMPAXELLA PACHYDERMA 53 



" 71. Actinal view of Fig. 70 .53 



" 72. A somewhat more magnified view of Fig. 71 ....... 53 



" 73. View of part of the actinal surface .......... 53 



" 74. Magnified profile view of portion of the base of a tentacle . . 53 



" 75. View of basal portion of tentacle, seen from above .... .53 



" 76. Profile view of TRACIIYXEMA CAMTSCHATICUM 56 



" 77. One of the genital organs . ........... 56 



" 78. Section of Trachynema ........... 56 



" 79. Chymiferous cavity at the end of the gelatinous proboscis . . 56 



" 80. View of Trachynema from above . ..... .56 



" 81. Adult female TRACIIYXEMA DIGIT ALE, seen in profile . . . .57 



" 82. Actinal view of the veil and circular tube of a very young Trachynema . . 57 



" 83. Profile view of a part of the circular tube . . . . . . .57 



" 84. Profile view of a young Trachynema, about one eighth of an inch in height . 58 



" 85. Somewhat more advanced than Fig. 84 .58 



u 86. Young Trachynema, measuring over one third of an inch in height . 59 



87. ? LIRIOPE SCUTIGERA. (L. Agassiz.) 60 



88. HALICLYSTUS AURICULA, seen from the actinal pole .... 63 

 " 89. Different attitudes of Haliclystus auricula, attached to eel-grass . . 63 



90. Young Haliclystus auricula, magnified ...... 63 



91. TIAROPSIS DIADEMATA, natural size. (L. Agassiz.) ... .69 



92. Young Tiaropsis, having twenty-four tentacles ... 69 



93. Young Tiaropsis, having forty tentacles. (L. Agassiz.) .... .69 



94. Two marginal tentacles of OCEAXIA LAXGUIDA, with a portion of the circular tube 70 



95. Magnified view of the actinostome ..... .71 



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