79 
again to a spherical form and remained passive as before. Other 
cases were noticed where actual division took place, but this was 
never connected with the amceboid movement. 
As the days passed, other changes occurred; a considerable 
number, after discharging the green parts of their contents, threw 
out cilia and remained as long as watched in this amceba condi- 
tion. Some of these were watched closely during change of 
form and color, particularly one, which corresponds very closely 
to one figured by Zopf, as one stage of the monad Pseudo- 
Spora parasitica, Cienk., which is well known for its fondness for 
Spirogyra cells. There were at least three distinct species of amceba 
found among the remains of these bodies, but their origin in all 
cases could not be determined. : 
The singularity connected with these organisms is the lack of 
proof that they were the developed form of certain monad spores 
which had bored their way into the cell, together with the fact 
that if they did have such an origin, they did not develop into 
the amoeba stage inside the cell, but simply gorged themselves 
with food and then issued forth in swarms to pass through other 
Stages outside. This, with the peculiar hypertrophy exhibited, 
which in only one case seemed to be of any use to the parasite, 
are the two features considered worthy of mention. 
DESCRIPTION OF PLATE CXXV. 
1.— Spirogyra cell showing beginning of tube formation at a. Contents of growing 
Portion colorless but granulated. ‘ : 
?, 3 and 4.—Cells showing different stages of this development. The inner lines 
show remains of chlorophyll bands. 
5-—A cell showing the second method, viz., the growth of tube into the adjacent cell. 
This seen ata. c, Cell nucleus. @. Another tube growing outward. 
6.—Cell with only a slight projection, but from which the green bodies 2 are about 
to escape. 
7.—Green body after having escaped. 
8 and 9.—Amceba forms originating from such bodies as 7. 
On the Names of two Species of Rhus. : 
Rhus cotinoides, N utt.—Regarding the synonymy of this 
plant, perhaps a few words may be said in addition to the re- 
vision already published by Prof. Sargent in Garden and Forest, 
iv. 340. As there shown, the earliest name for this plant 
is that of Nuttall, Cotznus Americanus (1842-'50), and wee 
