172 CARBONICOLA, ANTHRACOMYA, AND NAIADITES, 
I am greatly indebted to many fellow-workers in this field of Paleontology, to 
whom I wish to render my sincere thanks. Especially to Professors Dewalque, 
J. Fraipont, and M. Lohest of Liége, Prof. Geinitz of Dresden, Dr. Otto Jaekel of 
Berlin, and to Mons. L. Dollo of Brussels, who kindly assisted me to study the 
series of Coal-measure fossils in the respective Museums to which they are 
attached. 
IT also have to thank Dr. H. Woodward, Professor McKenny Hughes, Mr. J. W. 
Carr of Nottingham, Dr. John Young of the Hunterian Museum, Glasgow, 
Messrs. Crowther of Leeds, Howse of Newcastle-on-Tyne, Platnauer of York, 
W. Carr of Cardiff, H. Woods of the Woodwardian Museum, Hoyle of Owens 
College, and Crowther of Derby, for kind permission to study all the material 
in the various museums under their care, and for the loan of specimens for the 
purposes of figuring. 
Also to Messrs. J. W. Kirkby of Leven, Dr. J. R. S. Hunter of Braidwood, 
J. Neilson and J. Beveridge of Glasgow, J. Smith of Kilwinning, R. Kidston of 
Stirling, James Bennie of the Scotch Geol. Survey, R. Craig of Beith, Joseph 
Wright of Belfast, Wm. Madeley of Dudley, George Wild of Bardsley, C. Roeder 
of Manchester, G. Campbell of Wakefield, Wm. Pickup of Rushton Colliery, 
Johnson of Dudley, and John Ward of Longton for the loan of large collections, 
and for many details as to distribution. 
Also to Sir A. Geikie, Director-General, and Messrs. E. T. Newton, De Rance, 
Goodchild, and Nolan, of the Geological Survey of Great Britain and Ireland, for 
great assistance in the loan of type specimens from the Survey Museums of 
London, Edinburgh, and Dublin, and for valuable information on many points. - 
Also I have to thank Mr. F. R. C. Reed, of Cambridge, for kindly showing me the 
Woodwardian Collections on two occasions, and Mr. Bolton, of Owens College, 
Manchester, for his kindness in giving up to me a work which he had already 
begun, and for looking over proofs for me; and Mr. William Rupert Jones, who 
kindly verified references and made several bibliographical researches for me. 
I owe a special debt of gratitude to the Rey. Prof. Thomas Wiltshire and 
Prof. T. Rupert Jones for many valuable suggestions and much help. 
