430 UTRICULARIA CLANDESTINA. Car. XVIL 
being directed to the same side; the two longer ones being 
central, and the two shorter ones on the outside. 
The plants were collected in the middle of July; and the 
contents of five bladders, which from their opacity seemed full 
of prey, were examined. The first contained no less than 
twenty-four minute fresh-water crustaceans, most of them con- 
sisting of empty shells, or including only a few drops of red oily 
matter; the second contained twenty; the third, fifteen; the 
fourth, ten, some of them being rather larger than usual; and 
the fifth, which seemed stuffed quite full, contained only seven, 
but five of these were of unusually large size. The prey, 
therefore, judging from these five bladders, consists exclusively 
of fresh-water crustaceans, most of which appeared to be distinct 
species from those found in the bladders of the two former 
species. In one bladder the quadrifids in contact with a decay- 
ing mass contained numerous spheres of granular matter, 
which slowly changed their forms and positions. 
UTRICULARIA CLANDESTINA, 
This North American species, which is aquatic like the three 
foregoing ones, has been described by Mrs. Treat, of New Jersey, 
whose excellent observations have already been largely quoted. 
T have not as yet seen any full description by her of the structure 
of the bladder, but it appears to be lined with quadrifid 
processes. A vast number of captured animals were found 
within the bladders; some being crustaceans, but the greater 
number delicate, elongated larve, I suppose of Culicide. On 
some stems, “fully nine out of every ten bladders contained 
these larvze or their remains.” The larve “showed signs of life 
from twenty-four to thirty-six hours after being imprisoned,” 
and then perished. 
