INTRODUCTION 
7 
Frederick Braun in 1911, and, most important of all, durino- the three seasons 
of 1915, 1916, and 1917 by my former assistant, the late Dr. Herrick E. Wilson, 
who had before that made some collections there for the University of Chicago. 
Local conditions were favorable during his campaigns, which were fairly suc- 
cessful, and among his accjuisitions were some of the important types described 
in this work. 
The Neiv York Area 
Tn the eastern Silurian area the classic locality is Lockport, New York. 
Extensive exposures of the Rochester shale yielded a rich and varied fauna, 
among which were many new forms of crinoids which formed the types of 
genera and species described by Hall in the earlier volumes of the Paleontology 
of New York. The pioneer collections made by Professor Hall and Colonel 
Jewett ultimately passed into the possession of the American Museum of Natural 
History at New York, and the State Museum at Albany, where I have been 
afforded abundant opportunity for their study, as well as the types of Hall’s 
numerous species from Waldron. Another fine collection from the same forma- 
tion at Grimsby, Ontario, was assembled by the eminent financier, the late 
Sir Edmund Walker, which was also placed at my disposal, and is now in the 
University of Toronto. 
The most intimate and protracted study of the Lockport beds, shales and 
underlying limestones, was made by the resident physician. Dr. E. N. S. Ringue- 
berg. During a residence of more than thirty years he accumulated a large col- 
lection which formed the basis of several important publications by him from 
1882 to 1890, in which a number of new genera and species were described. The 
crinoids and cystids, including the types of Ringueberg’s species, were acquired 
by me, and form an important part of the material studied. In addition to this, 
I have the fruits of three campaigns in the years 1910, 1912 and 1914 at Lockport 
by the veteran collector, Erederick Braun, in my service. In the course of an 
intensive study of the shales he carried on large quarrying operations where the 
conditions were found favorable. Some of his acquisitions were of the greatest 
importance, notably among the Elexibilia and the aberrant genus Myelodaetyhis, 
as fully described in my monograph of the former group of 1920, and in the 
paper on Unusual Eorms of Eossil Crinoids, of 1926. 
While the Lockport fauna does not fall strictly within the limits of this 
work, some consideration of it is essential for purposes of comparison, as the 
formation is to be correlated with the Osgood of the Indiana area. 
1 Two New Species of Crinoids from Shale of the Niagara Group. Jour. Cin. Soc. Nat. Hist., Oct., 1882, 
p. 1 19; New Fossils from the Niagara Period, Proc. Acad. Nat. Sci. Phil., 1884, p. 144; New Genera and 
Species of Fossils from the Niagara Shales, Bull. Buff. Soc. Nat. Sci., 1886, p. 5; Some New Species of 
Fossils from the Niagara Shales, Proc. Acad. Nat. Sci. Phil., 1888, p. 131 ; The Niagara Shales of Western 
New York, Am. GeoL, May, 1888, p. 263: The Calceocrinidae : A Revision of the Family, and Description 
of New Species, Ann. New York Acad. Sci., 1880, p. 388; The Crinoidea of the Lower Niagara Limestone 
at Lockport, Ann. N. Y. .Acad. Sci., July, 1890, p. 301. 
