ANIMALS AS FOOD, FOES, OR FRIENDS. 345 



cases the softer parts of the insect bodies are digested and 

 absorbed. It should be noted, however, that adhesive sur- 



Fig. 384. B Fig. 385. A 



Fig. 384. — A bladder of Utricularia vulgaris, halved lengthwise, with an imprisoned 



crustacean, Cyclops, a to b, opening, with hairs, h, i, about it; b to c, cushion-like 



rim, b-c part cut through, d-e surface on which the flap,/, rests, opening inwards only ; 



g, wall of bladder set with absorbing hairs within and glandular hairs without ; k, the 



stalk (secondary petiole). Magnified 20 diam.— After Cohn. 

 Fig. 385. — Two leaves of sun-dew I ' Drosera rotundifolia). A, in expanded position 



showing the tentacles. />, shortly after the capture of an insect. The tentacles on the 



right half are inflexed to bring the glandular tips in contact with the prey. Magnified 



t.\ diam. — After Kerner. 



faces are also merely protective against the visits of unwel- 

 come guests, who steal nectar or pollen. (See ^j" 488.) 



469. 3. By move- 

 ments of traps and 

 adhesive surfaces. — 

 Somewhat more 

 complex methods of 

 capture are exhibited 

 by leaves which have 

 special movements 

 connected with traps 

 or sticky surfaces. 



T'V.^ c-,,- n A a .-,rr ^f «,,^ Fig. 386. — Cluster of leaves at the base of flower stalk 

 1 ne SUnaeW OI OUr o{ Venus' fly-trap {Dioncea muscipula). One-half 

 . „„, 1 --k 1 natural size. — After Drude. 



swamps has the edges 



and surface of the leaves covered with many outgrowths, 



