16 THE AMERICAN MIDLAND NATURALIST 
LOCALITIES REPORTED UPON. (ref. maps.) 
III—1. Lake Pepin, starting point of drags 1,500 ft. to- 
wards point with Light 957 from Wacouta Point, Minn., 100 
ft. from shore, starting at a clump of low willows. July 14, 
1920. 
Il1JI—4. About 2 miles below Bay City on Wisconsin shore, 
starting at a clump of willows and poplars at lower end of 
promontory with an altitude of 680. Drags 75 ft. off shore 
July 15, 1920. 
IlII—8» Drags from Point No-Point to Frontenac Point 
in a straight line between them, starting 300 ft. from shore 
of first, and finishing 75 ft. from shore of second. July 16, 
1920. 
NOTES ON AREA. 
In this section of Lake Pepin there exist clam beds known 
from their adjacent regions as the Maiden Rock and Warren- 
ton Beds. After poor success here, we learned from clam- 
mers, that while this was ordinarily a good locality, it was at 
this time covered with 6 in. of decaying vegetable matter 
brought in by the unusual rains of the summer, and this pre- 
vented the hooks from taking hold. Juveniles were somewhat 
less abundant than in the preceding area. 
During the entire period of our collecting in Lake Pepin, 
and less noticeably so in the lower stretches of the river, there 
was observed on the surface of the lake, masses of algal 
plankton occurring in the form of dots, short rods and ten- 
drils. Messrs.-H. W. Clark and R. 8. Corwin of the Fairport 
Biological Station state additionally concerning it, ‘‘the alga 
is practically all Aphanizomenon flos-aquae. It is predomin- 
ant in the plankton algae of the Upper Mississippi. It is 
abundant in Lake Pokegama also. There were one or two 
colonies of Anabaena spiroides and one Difflugia cratera in 
the mass examined.” 
The abundance of such plant food in Lake Pokegama and 
Lake Pepin may account in some degree for the abundance 
and excellent quality of the fat muckets found in those Lakes. 
Fresh water sponge was abundant on the Minnesota side of 
the lake. 3 
