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694 THE PALEONTOLOGY OF MINNESOTA. 
[Communication. 
COMMUNICATION. 
PROFESSOR N. H. WINCHELL, State Geologist. 
Srr:—At your request I have prepared the following discussion and illustration of the trilobites 
collected from the various faunas of the Lower Silurian in the state of Minnesota. In transmitting this 
paper for publication in your reports, permit me to record the obligation which I feel to you personally 
for the opportunity of studying and making notes upon this series of interesting fossils. At your instance 
only would the work have been possible. 
My indebtedness to Mr. E. O. Ulrich, the paleontologist of your survey, is also great, as he has 
placed at my disposal his private collections, not alone of Minnesota trilobites, but of those from other 
Lower Silurian localities, and this material has contributed substantially to the fullness of these observa- 
tions. He has also aided me with various timely and apt suggestions of which I have appreciatively 
availed myself. 
Several gentlemen have, through you, kindly submitted specimens of these Crustacea for the purpose 
of this work: Mr. W. H. Scofield, of Cannon Falls, Dr. C. H. Robbins, of Wykoff, and Mr. R. H. Hasse, of 
Granger. By the favor of Prof. C. E. Beecher, some specimens collected by Mr. Charles Schuchert and 
now belonging to the Peabody Museum of Yale University, have been placed in my hands. ‘To all these I 
beg to express here my appreciation of their consideration; to Mr. Schuchert especially for his friendly 
interest in the furtherance of the work. 
I have the honor to remain, sir, 
Very respectfully yours, 
JOHN M. CLARKE. 
Albany, N. ¥., January 2d, 1893. 
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