IHE 
AMERICAN NATURALIST 
VoL. XXXIV. August, TQO00. No. 404. 
ON THE NESTING HABITS OF THE BROOK 
LAMPREY (LAMPETRA WILDERI). 
ROBERT T. YOUNG anD LEON J. COLE. 
Tur following notes on the nesting habits of the brook lam- 
prey are not intended to cover completely this subject, but 
merely to amplify in a few details the observations of Gage! 
and Dean and Sumner? 
While at Ann Arbor, Mich., in the spring of 1899, we had 
the opportunity of observing several hundred brook lampreys 
nest building and spawning. They were in two small streams, 
about four miles west of Ann Arbor. The smaller was a trib- 
utary of the larger, and the latter emptied into the Huron 
River, a few miles from where my observations were made. 
From the mouth of this stream to Lake Erie the distance was 
about forty miles. We shall designate the smaller stream as 
A and the larger as B. Both streams flowed through meadow 
land. At points they were bordered by alders and willows. 
1 Gage, Simon Henry. Lakeand Brook Lampreys of New York, The Wilder 
Quarter Century Boo, 1893. 3 
? Dean, Bashford, and Sumner, Francis B. Notes on the Spawning Habits of 
the Brook Lamprey (Petromyzon wilderi), Zrans. New York Acad. of Sci., vol. 
xvi. Dec. 9, 1897. 
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