Page:Pennsylvanian invertebrates of the Mazon Creek Area, Illinois Eurypterida.djvu/14

 Konecny, Michael Moore, and Harry C. Witmer for the loan of their specimens. For the loan of other specimens used in this study I wish to thank the United States National Museum, through Dr. G. Arthur Cooper and Dr. Henry B. Roberts; the Museum of Comparative Zoology, through Dr. Harry B. Whittington and Dr. Donald Baird; the Princeton University Museum, through Dr. B. F. Howell; and the Peabody Museum, through Dr. Carl O. Dunbar. Mr. Matthew Nitecki, of the Walker Museum, University of Chicago, kindly lent the specimen of Adelophthalmus mansfieldi (C. E. Hall) shown in figure 51. My wife, Virginia Kjellesvig-Waering, has been of constant and most valued assistance, particularly in photographing the specimen of Mazonipterus cyclophthalmus.