INTRODUCTION 9 



Benedict ; both rich in Osgood, Laurel and Waldron echinoderms, and containing many types 

 of species from the Cincinnatian, Niagaran, and Hamilton of Indiana. 



Racine dolomites. A good representative series from the Chicago area, by exchange ; 

 and from equivalent horizons in New York and Ohio collected by Braun. 



Broimisport to Louisville. Collections made by Wachsmuth during several seasons in 

 Tennessee along the Tennessee River ; collections of great importance made by Professor Pate 

 for me in Decatur and adjoining counties, Tennessee, in 1906 and 1907, chiefly by extensive 

 quarrying operations. These yielded an extraordinary series of well-preserved crinoids which 

 includes many new forms, and representatives of European genera hitherto unknown in 

 America ; they will form the subject of a monograph now in preparation, for which drawings 

 are already made to fill at least 25 plates. A small but choice collection made by Mrs. J. M. 

 Milligan, of Jacksonville, Illinois, in Decatur County, Tennessee, containing the types of 

 several species from the Brownsport horizon described by Miller and Gurley. With the 

 S. S. Lyon collection much valuable material from that horizon was obtained, and Braun 

 collected there successfully in 1910. 



Wenlock. From Dudley, England ; a good local collection purchased at Dudley in 1887, 

 and many additional specimens obtained through exchange, and occasional purchase from 

 dealers ; the material thus secured being especially rich in good specimens of the Flexibilia, 

 in which from this locality it is more complete than any other outside of the British Museum. 

 From Gotland, Sweden ; collections made for me in 1894 and 1895 by Professor G. Klintberg, 

 and in 1906 by Mr. A. Florin, besides continual additions through purchases from dealers; 

 this material also is strong in rare species of Flexibilia. 



For 20 years I had a standing arrangement with the well-known fossil dealers, Krantz in 

 Bonn and Damon in Weymouth, to inform me of every new acquisition of crinoids and to 

 send me for examination such as I might designate. Much valuable material was from time 

 to time obtained in this way, especially from the English and Swedish Silurian, the Devonian 

 of the Eifel, and the Russian Carboniferous. 



devonian : 



Helderbergian and Oriskany. The collection of Frank Hartley, of Cumberland, Mary- 

 land, acquired in 1908, containing the types of species described by Schuchert ; it is rich in 

 echinoderms from the beds at Keyser, West Virginia, and contains the finest lot of Edriocrinus 

 and other forms (some undescribed) from the Oriskany ever obtained. Also collections made 

 by Braun in 1907 at Cumberland ; in the Linden beds of Tennessee ; and in 1912 at Cape 

 Girardeau, Missouri, in the equivalent Bailey limestone, producing the extraordinary speci- 

 mens of Scyphocrinus elegans, described in my memoir of 1917. Collections made by Mr. Pate 

 in 1914 and 191 5 in the Linden beds of Hardin and adjacent counties in Tennessee, yielding 

 the other specimens of Scyphocrinus and its bulbous root Camarocrinus forming the further 

 basis of the memoir upon those forms above mentioned. Good specimens of Scyphocrinus 

 were also obtained from the typical locality at Karlstein in Bohemia. 



Onondaga and Hamilton. The original collection of Col. Sydney S. Lyon, and that 

 subsequently made by his son, Mr. Victor W. Lyon, of Jeffersonville, Indiana, containing the 

 types of nearly all the species of Lyon, and of Lyon and Casseday, and some of Wachsmuth 

 and Springer, chiefly from the Onondaga and Hamilton rocks of the Louisville, Kentucky, 

 and Clark County, Indiana, areas ; and also important material from the Knobstone, Keokuk 

 and Kaskaskia beds of Indiana and Kentucky. Colonel Lyon had prepared drawings for the 

 species published by him mostly without illustration, intending to republish them with others 

 undescribed ; but his project was interrupted by the Civil War of 1861 to '65, through which 

 he served as a gallant officer in the Federal army. His drawings passed into my hands with 

 his collection, and they bear ample testimony to his keenness of observation and zeal in the 

 study of the crinoids. The younger Lyon was also an ardent collector for many years ; and 

 these two collections furnish the best exposition of the crinoid faunas of that region made up 



