Cuar. XVII] CAPTURED ANIMALS. 351 
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 antennz 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 foot- 
stalks. These glands are only the 3,49 of an inch (-019 
mm.,) in length; though so small, they act as absorbents. 
The collar is thick, stiff, and almost semicircular; 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 approximately concentric 
Tic. 28. 
(Ctricularia montana.) 
One of the quadrifid processes ; much enlarged. 
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. Each 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 are present in the 
cells forming the walls of the bladders. Bifid processes, 
having rather short oval arms, arise in the usual position on 
the inner side of the collar. 
These bladders, therefore, resemble in all essential respects 
the larger ones of the foregoing species. They differ chiefly 
in the absence of the numerous glands on the valve and 
round the collar, a few minute ones of one kind alone being 
present on the valve. They differ more conspicuously in 
the absence of the long bristles on the antennew and on the 
outside of the collar. The presence of these bristles in the 
