430 UTKICULAKIA CLANDESTINA. Chap. XVII. 



being directed to the same side ; tlie 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 stufi"ed 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. 



Utkicularia 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. 

 I 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 larvae, I suppose of Culicidse. On 

 some stems, "fully nine out of every ten bladders contained 

 these larvae or their remains." The larvae " showed signs of life 

 from twenty-four to thii'ty-six hours after being imprisoned," 

 and then perished. 



