Chapter IX. 

 Primitive Fishes in Time and Space 256 



Chapter X. 

 The Dipneusti and Crossopterygii in Time and Space 293 



Chapter XL 

 The Chondrostei and Holostei in Time and Space. . . 316 



Chapter XII. 

 The Soft-finned Teleostei in Time and Space 346 



Chapter XIII. 



The Spine-finned Teleostei in Time and Space 372 



Chapter XIV. 



Past Geographic and Geologic Conditions in Relation 



to the Distribution of Fishes 402 



Chapter XV. 

 Fishes in Relation to a South Atlantic Continent 431 



Chapter XVI. 

 A Review of the Tanganyilca Problem 463 



Chapter XVII. 



The Geographic and Geologic Relations of the More 



Primitive Fishes 483 



Chapter XVIII. 



Synoptic Review of Previous Chapters 503 



References to Literature 534 



Index 542 



