LIST OF FIGURES. 183 



FIGURE VOL. I. PAGE 

 GO. Contour map of the Gulf of Maine (U. S. C. 8.) ... .103 

 Gl. Contour chart of the bottom of the Atlantic, I". 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. Archsean map of North America (Dana) 130 



IX. THE PELAGIC FAUNA AND FLORA. (Figs. 63-139.) 



63. Arachuactis, embryo of Edwardsia, L - ..... .172 



64. Asteracanthion, starfish Pluteus, greatly magnified . . . . .172 

 64 a. Strongyloceutrotus, sea-urchin Pluteus, greatly magnified . . 172 



65. Cyphonautes, embryo of Bryozoon, greatly magnified .... 172 

 60. Littorina embryo, -^ .......... 172 



67. Embryo of loligo, - 2 T . . .172 



68. Tornaria, embryo of Balanoglossus, greatly magnified .... 173 



69. Pilidium, larva of Xemertean, greatly magnified ..... 173 



70. Leucodora larva, greatly magnified ........ 173 



71. Polygordius larva, -\- .173 



72. Dactylopus larva, greatly magnified ........ 173 



73. Barnacle, Balanus larva, greatly magnified ...... 174 



74. Squilla embryo, If- . . ... ... 174 



75. Hermit crab, Paguruy larva, greatly magnified ..... 174 



76. Peneus embryo, greatly magnified ........ 174 



77. Pelagic fish egg, if- . 175 



78. Plagusia. Pelagic symmetrical embryo of transparent flounder, i . . 175 



79. Rhombodichthys, flounder stage of Plagusia, ^ ..... 176 



80. Embryo fish, with lateral organs, ^ . . . . . . .176 



81. Phronima, f .176 



82. Leptocephalus, f 177 



83. Polyclouia frondosa, ^ (Agassiz) 178 



84. Copepod, greatly magnified 178 



85. Mysis, f . . 179 



86. Porpita, * .180 



87. Physalia Arethusa, Portuguese man-of-war, 1 (Agassiz) .... 181 



88. Lepas anatifa, floating barnacle, slightly reduced ... . 182 



89. Agalma elegans, \ (Fewkes) ... 182 



90. Cunina discoides, magnified ......... 182 



91. Velella mutica, f 183 



92. Pterophysa grandis, '-fa (Fewkes) . 184 



93. Linerges mercurius, | . 186 



94. Glossocodon tenuirostris, magnified ... . . . 186 



95. Fourth stage of Glossocodon tenuirostris larva, greatly magnified . . 186 



96. Sixth stage of Glossocodou tenuirostris larva, greatly magnified . 18G 



97. Jauthina, slightly reduced .... ... 186 



98. Glaucus, enlarged ........... 186 



99. Hyalea, f .187 



100. Atlanta, l 187 



101. Styliola, f . .188 



102. Pleuropus, x . . . . 188 



