New York State Education Department 
New York State Museum 
Joun M. Crarxe, Director 
Memoir 14 
THE EURYPTERIDA OF NEW YORK 
BY 
JOHN M. CLARKE 
AND 
RUDOLF RUEDEMANN 
PREFACE 
While the senior author of this work was engaged in the preparation 
of the monograph of the American Devonic Crustacea which constituted 
volume 7 of the Palaeontology of New York [1888], the forms of the 
Eurypterida there presented for consideration, led to the impression 
that it would be a service to paleontology to restate in detail the structure 
of this unique group of extinct creatures. The Siluric rocks of New York 
had proven so profuse in these remains that the material was not 
wanting for such analysis; the late Professor James Hall, who in 1859 had 
given the most intimate account of the eurypterids developed up to that 
time, concurred in the belief that the 30 years which had then passed 
would, with the aid of accumulated data and in the light of the con- 
tributions made by other writers, afford new facts worth recording. 
Not long after this Gerhard Holm published his very remarkable analysis 
of the structure of Eurypterus based on specimens from the Baltic Siluric 
and on the appearance of this exhaustive memoir it seemed that the anat- 
omy of the group could hardly be supplemented except by the estimation 
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