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BULLETIN OF THE NATURAL HISTORY SOCIETY. 
more uniform. In the former instance the waters are usually 
clear and transparent, in the latter generally muddy, discoloured 
and opaque. Finally, while in Passamaquoddy Bay especially, 
the bottom is not unfrequently found to consist of a fine mud, 
in which Diatoms are abundant, that of much of the shore 
facing the Gulf is made up of a fine sand brought down by the 
riyers from the great central Carboniferous plain which here 
borders the entire coast, and in this sand the Diatoms are com- 
paratively infrequent and difficult to separate. About the 
mouths of these rivers, however, such as the Richibucto and 
Miramichi, and in shallow bays and harbors like those of Richi- 
bucto and Bathurst, muddy areas may be found, while sub- 
merged objects, such as buoys, wharves and piers of bridges, 
are often coated with a muddy slime, largely made up of Diatoms. 
The same is true of the eel grass (Zostera) which grows profusely 
in shallow waters, and from these rich harvests may be gathered. 
The species of Diatoms so far obtained from the localities 
examined are given in the following lists. In presenting them 
I desire to express my indebtedness to Mr. Oliver Kendall, Jr., 
of Providence, R. I., who has not only checked most of them 
from material sent to him for that purpose, but has also added 
quite largely to their number. The literature employed in 
the identifications embraces Smith’s “British Diatoms,” Wolle’s 
“Diatoms of North America,” Schmidt’s “World Diatoms,” 
Van Heurch’s “Diatoms of Belgium,” Rabenhorst’s “Flora 
Europaea,” “La Diatomiste,” Pritchard’s “Infusoria,” Mann’s 
“Diatoms of the Albatross Expedition,” and various articles 
on Diatoms by J. W. Bailey, F. H. Lewis, Greville, Walker 
Arnott, A. M. Edwards and others. 
The work upon which this paper is based was done under 
the auspices and with the assistance of the Marine Biological 
Station at St. Andrews. 
Diatoms from Bathurst Harbor. 
Bathurst Harbor is a broad, shallow basin, traversed by 
two or more tidal currents, and receiving small additions of 
fresh water from streams about its head. Except for the very 
