t 
1074 The American Naturalist. [December, 
and the same species; and at the same time I avoid the use of the 
name darbata because it appears to me to be the result of a con- 
fusion of the author, who took foreign and parasitic elements for 
normal covering setæ. 
As already stated, those species found at 10,000 feet did not as 
rule show any difference from those described from the plains or 
in other continents, and showed the same relative abundance of 
individuals. Yet it will not be without interest to refer here to 
the utter absence of several forms of Rhizopods which one would 
have expected to find, and among which I shall only cite Hyado- 
sphenia “papilio Leidy, Nedela flabellulum Leidy, and Assulina 
semilunum Leidy. Hyalosphenia papilio is a very constant 
inhabitant of sphagnum-mosses; I do not think I ever found in 
- Europe a single bunch of sphagnum that was not replete with it. 
Nebela flabellulum, according to my experience, mostly affects the 
mosses in the woods, yet it is very frequently found in sphagnum. 
As for Assulina semilunum, its place was taken at Caribou by the 
species I have called Assulina minor. This latter form might be 
considered a dwarf variety of the former, and in fact must have 
been so regarded by Leidy, who has figured two shells belonging 
apparently to it (Pl. xxxvii., Figs. 15 and 26). But besides the 
considerable and absolutely constant difference in size, there are 
others characters which decided me to make of it a distinct 
species, and the fact that at Caribou this form was absolutely the 
only one to be met with would constitute, if necessary, further 
proof of the correctness of my decision. 
I come now to the list of the species that I found in the mosses 
of a swampy pasture-ground, under the summit of the hill called 
Bald Mountain, and about 12,000 feet above the level of the sea. 
Sphagnum does not grow at so high an altitude, and consequently 
was not represented among these mosses: Amoeba , Sp. 
nov.? Diffugia pyriformis Perty (small variety), Diffugia con- 
stricta Ehrenberg, Diffugia rubescens, sp. nov., Nebela collaris 
Leidy (and small variety), Nedela longicollis Penard, Nebela den- 
tistoma Penard, Arcella microstoma Penard, Pseudochlamys patella 
Clap.and Lachmann, He/eopera rosea Penard. 

