848 UTRICULARIA CLANDESTINA. [Chap. XVII. 



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 con- 

 tents 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 consisting 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 unusu- 

 ally large size. The prey, therefore, judging from these five blad- 

 ders, 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 decaying mass contained numerous spheres of granular mat- 

 ter, 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. 

 1 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 blad- 

 ders; some being crustaceans, but the greater number delicate, 

 elongated larva;, I suppose of Culicidee. On some stems, " fully 

 nine out of every ten bladders contained these larvae or their re- 

 mains." The larvae " showed signs of life from twenty-four to 

 thirty-six hours after being imprisoned," and then perished. 



