454 UTRICULARIA MONTANA. Cuap. XVIII 
and rubbish; so that the curvature of the antenne is 
a serviceable character. There are no bristles on the 
outside of the collar or peristome, as in the foregoing 
species. 
The valve is small and steeply inclined, with its free 
posterior edge abutting against a semicircular, deeply 
depending collar. It is moderately transparent, and 
bears two pairs of short stiff bristles, in the same 
position as in the other species. The presence of these 
four bristles, in contrast with the absence of those on 
the antenne and collar, indicates that they are of 
functional importance, namely, as I believe, to prevent 
too large animals forcing an entrance through the 
valve. The many glands of diverse shapes attached 
to the valve and round the collar in the previous 
species are here absent, with the exception of about 
a dozen of the two-armed or transversely elongated 
kind, which are seated near the borders of the valve, 
and are mounted on very short footstalks. These 
glands are only the +35, of an inch (019 mm.) in 
length ; though so small, they act as absorbents. 
The collar is thick, stiff, and almost semi-circular; it 
is formed of the same peculiar brownish tissue as in 
the former species. 
The bladders are filled with water, and sometimes 
include bubbles of air. They bear internally rather 
short, thick, quadrifid processes arranged in approxi-. 
mately concentric rows. The two pairs of arms of 
which they are formed differ only a little in length, 
and stand in a peculiar position (fig. 28); the two 
longer ones forming one line, and the two shorter ones 
another parallel line. Hach arm includes a small 
spherical mass of brownish matter, which, when 
crushed, breaks into angular pieces. I have no doubt 
that these spheres are nuclei, for closely similar ones 
