LIST OF FIGURES. 



183 



Figure vol - l 



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



61. Contour chart of the bottom of the Atlantic, V . S. Hydrograpkic Of- 



fice ............ 



PAGE 



103 



108 



VI. 



62. 



63. 



64. 



64 a. 



65. 



66. 



67. 



68. 



69. 



70. 



71. 



712. 



73. 



74. 



75. 



76. 



77. 



78. 



79. 



80. 



81. 



82. 



83. 



84. 



85. 



86. 



87. 



88. 



89. 



90. 



91. 



92. 



93. 



ill. 



95. 



96. 



97. 



98. 



99. 



100. 



101. 



102. 



129 

 130 



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



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

 cock ............ 



Archaean map of North America (Dana) 



■ 



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



Arachnaetis, embryo of Edwardsia, x ^- 

 Asteracanthion, starfish Pluteus, greatly magnified . 



Strongylocentrotus, sea-urchin Pluteus, greatly magnified 

 Cyphonautes, embryo of Bryozobn, greatly magnified 

 Littorina embryo, ','" ....... 



Embryo of loligo, - 2 £ ...... 



Tornaria, embryo of Balanoglossus, greatly magnified 

 Pilidium, larva of Nemertean, greatly magnified 

 Leueodora larva, greatly magnified ..... 



Polygordius larva, %£■ ...... 



Dactvlopus larva, greatly magnified ..... 



Barnacle, Balanus larva, greatly magnified 



Scpiilla embryo, %£■ ....... 



Hermit crab, Pagurus larva, greatly magnified 



Peneus embryo, greatly magnified ..... 



Pelagic fish egg, ^ L ...... . 



Plagusia. Pelagic symmetrical embryo of transparent flounder, ± 

 Rhombodichthys, flounder stage of Plagusia, \ 

 Embryo fish, with lateral organs, -^ 

 Phronima, | . . . . 



Leptocephalus, | . . . 



Polyclonia frondosa, ^ (Agassiz) 



Copepod, greatly magnified 



Mysis, | . 



Porpita, * . 



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



Lepas anatifa, floating barnacle, slightly reduced 



Agalma elegans, \ (Fewkes) 



Cunina discoides, magnified 



Velella mutica, f . . . 



Pterophysa grandis, T V (Fewkes) 



Linerges mercurius, £ 



Glossocodon tenuirostris, magnified 



Fourth stage of Glossocodon tenuirostris larva, greatly magnified 



Sixth stage of Glossocodon tenuirostris larva, greatly magnified 



Janthina, slightly reduced 



Glaucus, enlarged 



Hyalea, ^ . 



Atlanta, \°- .... 



Styliola, f . . . . 



Pleuropus. W .... 



