LIST OF FIGURES. 



183 



Figure Vol. I. page 



60. Contour map of the Gulf of Maine (U. S. C. S.) 103 



Gl. Contour chart of the bottom of tlie Athintic, U. S. Hydrographic Of- 

 fice 108 



VI. The Permanence of Continents and of Oceanic Basins. (Fig. 62.) 



Geological map of the Eastern United States, after C. H. Hitch- 

 cock 129 



62. Archfean map of North America (Dana) 130 



IX. The Pelagic Fauna and Flora. (Figs. 63-139.) 



63. Arachnaetis, embryo of Edwardsia, ^ . . . . 



64. Asteracanthion, starfish Pluteus, greatly magnified . 

 64 a. Strongylocentrotus, sea-urchin Pluteus, greatly magnified 



65. Cyphonautes, embryo of Bryozoon, greatly magnified 



66. Littorina embryo, ij**- 



67. Embryo of loligo, ^^' 



68. Tornaria, embryo of Balanoglossus, greatly magnified 



69. Pilidium, larva of Nemertean, greatly magnified 



70. Leucodora larva, greatly magnified . 



71. Polygordius larva, ^A . . . . . 



72. Dactylopus larva, greatly magnified . 



73. Barnacle, Balanus larva, greatly magnified 



74. Squilla embryo, l^. ...... 



75. Hermit crab, Paguruy larva, greatly magnified 



76. Peneus embryo, greatly magnified . 



77. Pelagic fish egg, ^j^ ...... 



78. Plagusia. Pelagic symmetrical embryo of transparent flounder, ^ 



79. Rhombodichthys, flounder stage of Plagusia, ^ 



80. Embryo fish, with lateral organs, ^^- 



81. Phronima, | . . . . . 



82. Leptocephalus, | . . . . 



83. Polyclonia frondosa, ^ (Agassiz) 



84. Copepod, greatly magnified 



85. Mysis, f 



86. Porpita, * 



87. Physalia Arethusa, Portuguese man-of-war, 1 (Agass 



88. Lepas anatifa, floating barnacle, slightly reduced 



89. Agalma elegans, ^ (Fewkes) 



90. Cunina discoides, magnified 



91. Velella mutica, f . . . . 



92. Pterophysa grandis, '-^^ (Fewkes) 



93. Linerges mercurius, | . . . 



94. Glossocodon tenuirostris, magnified . 



95. Fourth stage of Glossocodon tenuirostris larva, greatly magnified 



96. Sixth stage of Glossocodon tenuirostris larva, greatly magnified 



97. Janthina, slightly reduced 



98. Glaucus, enlarged 



99. Hyalea, f 



100. Atlanta, ^ 



101. Styliola, f . . ... 



102. Pleuropus, \°- 



siz) 



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