62 PALAEONTOLOGY. 



Besides the magnificent collections of Mr. Frank Springer and Mr. 

 W. C. Van Home, in the use of which we have enjoyed unrestricted 

 liberties, we are indebted for valuable aids, which are duly acknow- 

 ledged at the proper place in the accompanying text. Through 

 the courtesy of Dr. Charles A. White, palaeontologist of the U. S. 

 Geological Survey, we have had access to the collections of the 

 National Museum, which have been brought in by Government ex- 

 peditions to the Territories. We are also under great obligations to 

 Dr. Joseph Leidy, who kindly procured us the loan of valuable 

 types belonging to the Museum of the Academy of Natural Science 

 of Philadelphia. It affords us pleasure in rendering acknowledg- 

 ments and our thanks to Lord Enniskillen and Dr. L. de Koninck, 

 for valuable information in relation to the occurrences of Carbon- 

 iferous fishes in Great Britain and Belgium. We are also specially 

 indebted to Mr. Charles Wachsmuth, who has favored us with much 

 additional material from the Kinderhook and Burlington formations. 

 Similar favors have also been extended us by Mr. L. A. Cox, of 

 Keokuk, Mr. Alexander Butters, formerly of Carlinville, and Dr. 

 George Hambach, of St. Louis. We have also had the use of Mr. 

 L. A. Fuller's collection, and Mr. A. S. Tiffany, of Davenport, has 

 placed in our hands some very interesting material from various 

 Carboniferous and Devonian formations. Professor I. C. White, of 

 the Pennsylvania Geological Survey, has kindly furnished us material 

 from the Lower Carboniferous fish-horizons, which he has discovered 

 in Western Pennsylvania; but these last, we regret, we have been 

 compelled to omit in the present work. 



0. ST. J. and A. H. W. 



