320 
Bulletin of ruF Natural History Society. 
Since the foregoing article was jiut in type collections have been made 
from two additional localities, both of purely fresh water character. 
Diatoms from Lawlor’s Lake, St. John County: 
Cocconema lanceolatum Ehr. 
Cocconema cistula Ehr. 
Himantidium undulatum W. Sm 
Himantidium arcus W. Sm. 
Himantidium gracile Ehr. 
Cyclotella Kutzingiana Thw. 
Navicula (Pinnularia) viridis W. S. 
Navicula (Pinnularia) major W.S. 
Cymbella gastroides Kg. 
Epithemia turgida W. Sm. 
Epithemia zebra Ehr. 
Encyonema coespitosum 
Synedra ulna Ehr. 
Stauroneis phoenicenteron Ehr. 
Pleurosigma attenuatum W. Sm. 
Tabellaria flocculosa Kutz. 
Nitschia scalaris? W. Sm. 
Diatoms from Otnabog Lake, Queens County: 
Cocconeis placentula 
Navicula viridis W.S. 
Navicula elliptica (Smithii). 
Navicula nobilis Ehr. 
Navicula radiosa? Kg 
Epithemia turgida W. Sm. 
Epithemia zebra Ehr. 
Tabellaria fenestrata Kutz. 
Tabellaria flocculosa Kutz. 
Gomphonema constrictum Ehr. 
Gomphonema geminatum Ag. 
Stauroneis phoenicenteron Ehr. 
Stauroneis anceps Ehr. 
Stauroneis acuta 
Tryblionella 
Campylodiscus (costatus?) N. S. 
Cymatopleura solea 
Himantidium gracile Ehr. 
Himantidium undulatum W Sm. 
Pleurosigma attenuatum W. Sm. 
Orthosira orichalcea W. Sm 
Nitschia sigmoidea W. Sm. 
Nitschia bilobata W. Sm. 
Surirella elegans Ehr 
Surirella intermedia 
Surirella splendida Kutz. 
Cocconema lanceolatum Ehr. 
Cocconema cistula Ehr. 
Synedra ulna Ehr. 
Cyclotella Meneghiniana Kg. 
Cyclotella compta. 
Stephanodiscus Niagarae Ehr. 
Otnabog Lake is about thirty-nine miles distant from the outlet of the 
St. John river and about twenty-seven from the mouth of the Nerepis. It 
is separated from the main channel of the St. John only by a narrow striP 
of intervale, which is submerged during freshets. It is subject to a slight 
rise and fall due to backing up of the water through the change of tide a^ 
the mouth of the river, but no salinity is evident to the taste. The only 
species which would seem to suggest the influence of salt water is Nitschia 
bilobata, which is described by Smith as brackish. It is not probable that 
any marine or brackish water forms would be found in the main St. John 
above this point. 
