8 SMITHSONIAN INSTITUTION 



including important types of species described by him. Mr. George K. Greene, 

 of New Albany, Indiana, had the types of species described by Rowley in Mr. 

 Greene's Contributions to Indiana Palaeontology, and since his decease pend- 

 ing the publication of this volume his collection has been acquired by the Amer- 

 ican Museum. The collection of the late Professor Borden at Borden, formerly 

 New Providence, Indiana, contains specimens obtained by Dr. Knapp at Louis- 

 ville, and Dr. Harrod at Canton, Indiana. 



All the foregoing collections I have carefully examined, and through the 

 courtesy of their owners I have selected from them such specimens as I desired 

 for study and figuring, as already stated. 



It must be said, however, I hope without unseemly pretension, that for 

 the elucidation of the group of crinoids under consideration in this work by 

 far the most important and extensive material is that contained in my own 

 personal collection, now deposited in the National Museum. This has come 

 about not only through the acquisition by purchase of many old and typical 

 collections, but because for 20 years I have given close attention to the 

 assembling of specimens pertaining to this group with special reference to 

 these researches. A brief statement of the sources from which the collection 

 is derived will indicate the nature and extent of this material : 



ordovician : 



Chazyan. Collections by Wachsmuth, Wetherby, and Braun from the Ottosee formation 

 in Knox and Granger counties, Tennessee. 



Trenton. The collection of Professor W. F. Pate, of Lebanon, Kentucky, especially 

 rich in crinoids from the Mohawkian area of Woodford and Mercer counties, Kentucky. 

 Collections made for me by Dr. E. Kirk at Kirkfield, Ontario, Canada, containing among other 

 things the material used in my memoir on a Trenton Echinoderm Fauna, published by the 

 Geological Survey of Canada in 191 1. Also excellent material from the beds at Ottawa, 

 Canada, obtained through Mr. Walter R. Billings, and from the Black River beds at Minne- 

 apolis, Minnesota, and Mineral Point, Wisconsin, collected by Dr. Sardeson and by Mr. Braun. 



Cincinnatian. The original collection of Mr. J. Kelly O'Neall, of Cincinnati, containing 

 types of several of Hall's species described in the Ohio Reports ; many specimens from the 

 Cincinnati area obtained by purchase and exchange ; collections made by Braun in the Oswego 

 area, Illinois ; and important type and other material in the S. S. Lyon collection. 



Foreign Ordovician. An important series collected for me by Professor J. J. Jahn, of 

 Briinn in Bohemia, from Etage d 4 near Zahoran. 



SILURIAN : 



Rochester Shales. The extensive collection of Dr. E. N. S. Ringueberg at Lockport, 

 New York, containing the types of his species, and material accumulated during many years 

 of careful collecting. Still larger collections made by Mr. Braun for me at Lockport, through 

 extensive quarrying in the productive layers during the seasons of 1910, 191 1 and 1914. 

 Collections in the Osgood area of Indiana by Beachler. 



Laurel and Waldron. Collections at St. Paul, Indiana, by Beachler in 1887 ; Braun in 

 191 1, and Wilson in 191 5, 1916 and 1917 ; also specimens from Dr. Moses Elrod at Hartsville, 

 and from Dr. C. C. Washburn, of Waldron, prior to the acquisition of his collection by the 

 University of Chicago. Collections made by Pate, Braun and Bassler in the Waldron beds of 

 Tennessee. The collection of John F. Hammell, of Madison, Indiana, including that of A. C. 



