FRESH WATER DIATOMS. 
317 
deposits may indicate deposition in salt water and the later in 
fresh, owing to elevation from conditions of marine submergence. 
Such changes will also have had their influence upon the 
characteristics of the contained species, and observations, 
indicative of such change, have already been made by the writer. 
At present only four deposits of Tripolite or Infusorial 
Earth, as found in New Brunswick, are known to the writer, 
viz., ( I ) at Fitzgerald Lake, about seven miles from the city 
of St. John; (2) at Pollet Lake, in Mechanics Settlement, King’s 
County; (3) on the Kingston peninsula about one mile east of its 
western extremity, and (4) in Cover Lake, at the head of the 
Upper North Branch of the Little S. W. Miramichi River. The 
species observed in these several localities are given below. 
Diatoms from Fitzgerald Lake, St. John Count}' 
The deposit at this locality has been described by Dr. J. G. 
Baxter in the Proceedings of the Miramichi Natural History 
Association, No. Ill, 1908, where it is said to cover an area of 
about fifty acres, with a maximum depth of thirty feet. Dr. 
Baxter also gives a list of species, but in that which follows only 
those are included which have been identified either by myself 
or Mr. O. Kendall. 
Stauroneis phoenicenteron. 
Pinnularia major. 
Pinnularia viridis common. 
Pinnularia nobilis Ehr. 
Pinnularia dactylus Kg. 
Surirella splendida. 
Sm-irella biseriata. 
Himantidium arcus. 
Cymbella cuspidata Kg. 
Cymbella gastroides Kg. 
Cymbella heteropleura Kg. 
Cocconeis disrupta Greg. 
Epithemia succincta. 
Gomphonema capitatum. 
Gomphonema acuminatum. 
Stauroneis gracilis Ehr. 
Synedra ulna. 
Eunotia monodon Ehr. 
Eunotia major. 
Eunotia n. sp 1 
Fragillaria construens Grun. 
Navicula Brebissonii Kg. 
Navicula firma Kg. 
Navicula dilatata Ehr. 
Navicula ovalis. 
Navicula cuspidata. 
Nitschia spectabilis Ralfs. 
Tabellaria fenestrata. 
