Euglenopsis : a New Alga-like Organism '. 
BY 
BRADLEY MOORE DAVIS. 
With Plate XIX. 
T HE writer first noticed specimens of this interesting 
organism in November, 1893, while examining some 
material collected in the salt-marshes of the Charles river, 
Cambridge, Massachusetts. It proved to be very common 
at that season of the year and covered stems of marsh-grass 
[Spar find) and other objects floating near the surface of quiet 
pools, so thickly that the surface of these bodies resembled 
dark green velvet in colour and texture. Mixed with it were 
sometimes colonies of the non-motile condition of Cryptoglena 
americana , Davis, or occasionally clusters of Diatoms, but on 
the whole the organism was remarkable for its habit of 
thickly covering its substratum to the exclusion of other 
forms. 
The characters of this organism are such that it may not 
be apparent to all readers why it should be considered as 
a plant and not an animal, but the peculiarities of its structure 
and mode of growth are so interesting, and its affinities so 
close to certain genera usually considered as plants, that the 
writer feels justified in presenting the paper to botanists. 
1 Contributions from the Cryptogamic Laboratory of Harvard University, 
No. XXV. Prepared under the direction of Dr. W. G. Farlow. 
[Annals of Botany, Vol. VIII. No. XXXII. December, 1894.] 
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