245 
Micrasterias Torreyi (Bailey) Ralfs. November 23, 1892. 
M. radiosa (Ag.) Ralfs. Occasional. 
M. denticulata (Breb.) Ralfs. April, 1893. 
M. fimbriata, Ralfs. Occasional. 
M. Americana (Ehrb.) Kiitz. Occasional. 
Staurastrum dejectum, Breb. November and April. 
S. brevispinum, Breb. Frequent. 
S. aristiferum, Ralfs. J nfrequent. 
S. brachiatum, Ralfs. Infrequent. 
S. cuspidatum, Breb. » December, 2-24. 
S. polymorphum, Breb. Infrequent. 
S. crenulatum, Naeg. Common. 
S. punctulatum, Breb. December 2. 
S. hirsutum (Ehrb.) Breb. April. 
S. Arctiscon, Ehrb. F requent. 
DIATOMACE. 
Amphora ovalis, Kiitz. December 1 ‘e 
Lncyonema ventricosa, Kiitz. Not rare. 
Stauroneis anceps, Ehtb. Infrequent. 
Navicula cuspidata, Kiitz. Not common. 
NV. dilatata, Ehrb. December 17. 
NV. gibba (Kiitz.) Ehrb. Frequent. 
LV. radiosa, Kiitz. Frequent. 
NV. rhyncocephala, Keeog 
LV. viridis, Kiitz. Small forms, infrequent. 
Pleurosigma Spenceri, W. Sm. Occasional. 
Pleurosigma, sp. indet. 
Amphiprora ornata, Bailey. Frequent. 
Gomphonema acuminatum, Ehrb. Frequent, var. coronata, Ehrb.— 
December 17. 
G. capitatum, Ehrb. February 11. 
Cocconeis Pediculus, Ehrb. April. 
Lpithemia gibba (Ehrb.) Kitz. December 2. 
Lunotia tridentula, Ehrb.  ? 
Synedra pulchella, Kiitz. Frequent. 
S. Ulna (Nitzsch.) Ehrb. Common. 
Synedra, sp. indet. Common. 
