18 THE AMERICAN MIDLAND NATURALIST 
AREA IV. 
Boundaries, Maiden Rock, Wis., and Frontenac, Minn. to 
Lake City, Minn. and Stockholm, Wis. Status, closed to fish- 
ery. Length in Linear Miles, 6.7. Physical Conditions, 5 ft. 
high water; bottom varying from pebbles, to sand and mud; 
current 1144 to 2 miles per hour. Patches of water weed 
abundant. 
LOCALITIES REPORTED UPON. (ref. maps.) 
1V—9. Opposite Mrs. Coles estate, starting at point be- 
tween brown barn and white house at 700 ft. elevation, 65 ft. 
from shore, proceeding toward bend. July 19, 1920. 
1V—11. Along Lake City Park front, starting at a poplar 
tree in front of fishermen’s shanty, proceeding downstream 
toward bend in stone wall. 250 ft. off shore. July 20, 1920. 
IV—12. At Lake City, between Lake City Point Light and 
breakwater, starting 40 ft. off shore, from center of space 
between small house and ice-house. July 20, 1920. 
NOTES ON AREA. 
Clammers believe this area to be pretty well clammed out, 
although it contained more juvenile shells than previously en- 
countered in other areas. This fact seems reasonably due to 
the propagation experiments which the Bureau of Fisheries 
has been conducting in the region for several years. This 
area really produces the larger number of juveniles than any 
other considered, but as adult shells from these localities are 
in the great minority, the juveniles are not represented in 
the check localities given. All data submitted for juveniles 
is from the standpoint of their frequency in clam beds, where- 
as below Lake Pepin they were found to be most abundant on 
the sand bars. The juveniles were mostly L. siliquoidea. The 
water weeds encountered were Vallisneria spiralis, Cerato- 
phyllum demersum, and various species of Potamogeton. The 
party gained the impression that the abundance of juveniles 
in an area was related to the abundance of the water weed. 
Species of fresh water snails, and a crayfish collected were 
determined by Dr. A. E. Ortmann to be Campeloma subsoli- 
