AFTERWORD 



NOTES ON THE PLATES 



In illustration of what I have said regarding the 

 evolution of our trout, let me show you first the family 

 tree which extends its roots into Mesozoic if not Pale- 

 ozoic time. Back in the Carboniferous Period, many 

 times more than one million years ago, when the United 

 States lay under the ocean, lived a fish whose fossil 

 remains are represented in picture of fossil, (Plate 

 No. I) as restored by Dr. J. S. Newberry, late Pro- 

 fessor of Geology in Columbia University, and you 

 will note that this fish of the Carboniferous Sea has 

 a well marked adipose dorsal fin, and hence perhaps 

 is entitled to figure as the remote progenitor of present 

 time salmonids. We are obliged to look far behind 

 the fossils of the recent Pleistocene deposits and ferru- 

 ginous sands of Idaho — where an entire large fossil 

 salmonid has been found {Rhabdofario lacustris) — 

 and of Oregon, for the veritable ancestor of our salmon 

 race. Dr. Jordan records the print of an adipose fin 



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