INTRODUCTION - / 



The American Museum at New York contains most of the types of the 

 crinoids described by Hall in the New York Reports ; and the State Museum at 

 Albany has nearly all the remainder, as well as the types of Hall's species from 

 the Waverly of Ohio. 



The Museum of Cornell University at Ithaca has the types of the species 

 described by Williams, and also one or two of those described by Hall. 



The Victoria Memorial Museum of Ottawa, administered by the Geolog- 

 ical Survey of Canada, contains the material which served as the basis of 

 E. Billings's important memoirs on the Crinoids and Cystids of Canada, and 

 specimens described by Walter R. Billings; and the University of Toronto 

 possesses a splendid collection of Devonian and Silurian crinoids presented to 

 it by Sir Edmund Walker, including types studied by Parks. 



The Walker Museum of the University of Chicago is a rich repository of 

 fine crinoidal material. In addition to the collection of Gurley, containing most 

 of the types of Miller and Gurley's numerous species, and the second collection 

 of James Hall, there are those made by Dr.- C. C. Washburn and by Dr. Herrick 

 E. Wilson from the Indiana Silurian ; that of Sir William van Home from the 

 Silurian and Carboniferous of Illinois; that of Mr. F. A. Sampson from the 

 Carboniferous of Missouri ; the numerous specimens obtained in recent years 

 by Dr. Stuart Weller in connection with his field work for the Illinois Geolog- 

 ical Survey, and the types of the many species described by him from the 

 Silurian of the Chicago area and from various other formations. Dr. Weller's 

 information and advice touching the geological position of several crinoidal 

 beds in southern Illinois have been of the utmost service in the placing of cer- 

 tain species of doubtful horizon described in the early western reports. In this 

 collection are now to be found the long missing types of Owen and Shumard's 

 species described in 1852, rescued from a rubbish barrel at the old David Dale 

 Owen headquarters in New Harmony, Indiana. 



The University of Illinois at Champaign possesses the original collection 

 of Professor Worthen, containing the types of Hall's species described in the 

 Iowa Report of 1858; while in the State Museum at Springfield is the abundant 

 material accumulated by the Geological Survey of Illinois under Worthen, in- 

 cluding" many types described by Meek and Worthen in the Illinois Reports. 



The University of Iowa, at Iowa City, has some excellent material col- 

 lected by Professor Calvin, and also the fine collection of Recent crinoids 

 obtained by Professor Nutting on his remarkable dredging expedition to the 

 West Indies in 1893. I n the Davenport Academy of Sciences are some types of 

 species described by Barris; and in the Academy of Science of St. Louis some 

 of the early collections of Shumard and Yandell. 



Professor R. R. Rowley at Louisiana, Missouri, has an extensive collec- 

 tion of Missouri crinoids from Carboniferous, Devonian and Silurian rocks, 



