INVESTIGATIONS IN MINNESOTA AND NORTH DAKOTA. 347 
+, 
flat spiral shell hung suspended in the water. The genus Limnea was 
‘more abundant, both in variety and numbers. Limpets fastened to the 
bottom and sides of stones were also abundant. 
- Though the food supply is -plentiful, comparatively few fishes were 
found in the lake; owing tothe great number of bowlders thickly strewn 
over the bottom of the lake the seine could not be used to good advan- 
tage, but from observation and what could be learned from local fisher- 
‘men, about the only food species taken are pickerel (Lucius lucius), 
eatfish (Ameiurus nebulosus), and a few strawberry bass (Pomowis); nor 
are these varieties as abundant as in former years. No small fishes 
were observed in the lake proper, and frequent attempts with hook and 
line failed. 
_ The two tributaries of Lake Traverse were examined, which com- 
pleted the work in this lake. 
_ The specimens obtained give a fair representation of the fish fauna 
of this basin. by 
Daugherty Creek, Browns Valley, Minnesota, July 13, 1892.—This is 
the largest western tributary of Lake Traverse. It flows into the lake 
about 8 miles from the southern end, and is only a meadow brook 8 or 
10 miles long, the outlet of two small “grass lakes.” The stream will 
average 6 feet in width and has a rapid current in the narrow places. 
‘The depth of the water varies from 1 to3 feet. The bed of the stream 
is of gravel and coarse stones. The banks are overgrown with grass 
and other prairie vegetation, but no trees are to. be found. In the 
more quiet places the water is matted with water vegetation, Pota- 
mogeton, Myriophillum, Sagittaria, Lemna, and a few species of alge. 
The temperature of the water was 67°.* Numerous small crustaceans 
and insects sported among the tangled vegetation. As a southern 
tributary to this stream, a small spring brook added its waters, which 
were much cooler, 62°. The stream is well stocked with fish, but of 
few species. During the spring pickerel (Lucius lucius) ascend to 
Spawn, and we were informed on good authority that they sometimes 
fill the stream and can be thrown upon the bank with forks or shovels 
in large numbers. 
_ Muslinka River, Wheaton, Minn., July 22.—This river rises in the 
central portion of Grant County, Minn., flows a general southeasterly 
direction for 25 miles, and joins Lake Traverse at its head, or northern 
end. The stream lies at the bottom of a broad, shallow valley, one-half 
to three-fourths mile in width, and is by far the largest and longest 
tributary of this lake, but it is little more than “a wet-weather drain.” 
It is long and winding, with low banks and a current that moves so 
‘Slowly that its motion is almost imperceptible; it does but little, except 
during the season of greatest rainfall, to replenish the waters of the 
lake. The stream will average 18 feet in width and 24 feet in depth. 
*The temperatures given in this paper are in Fahrenheit degrees, and were deter- 
‘Mined by means of a Wilder protected thermometer. 
‘ 
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