ACKNOWLEDGMEN 



25-3, 626 Courtesy of University of Michigan 25-19, 645 



Museum of Zoology 

 25-4, 627 Courtesy of University of Michigan 25-20, 647 



Museum of Zoology 

 25-5, 628 After Simpson, The Meaning of Evo- 26-1, 651 



lution, Yale University Press 

 25-6, 629 Courtesy of I. J. Reiman, University 26-2, 653 



of Michigan Museum of Zoology 

 25-7, 630 Courtesy of I. J. Reiman, University 26-4, 657 



of Michigan Museum of Zoology 

 25-8, 631 After Simpson, The Meaning of Evo- 26-5, 660 



hifion, Yale University Press 26-7 66'' 



25-14, 639 Partly after Neal and Rand 

 25-16, 641 Partly after Patten 

 25-17, 642 Adapted from Amberson and Smith, 26-9, 665 



Outline of Physiology, Appleton-Cen- 



tury-Crofts, Inc. 26-10, 667 



25-18, 644 J. L. Dusi 



TS 



681 



Courtesy of University of Michigan 

 Museum of Zoology 

 After Simpson, The Meaning of Evo- 

 lution, Yale University Press 

 Courtesy of University of Michigan 

 Library 



Courtesy of Uni\ersity of Michigan 

 Museum of Zoology 

 Mostly from specimens in Uni\ersity 

 of Michigan Museum of Zoology 

 After Hesse and others 

 Adapted in part from Simpson, The 

 Meaning of Evolution, Yale Univer- 

 sitv Press 



Courtesy of the General Biological 

 Supply House 



Courtesy of University of xMichigan 

 Museum of Zoology 



