ANIMALS AS FOOD, FOES, OK 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, //, 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. 3S5.— Two leaves of sun-dew I Drosera rotundifolia). A, in expanded position 



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



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



z\ diam. — Alter Kerner. 



faces are also merely protective against the visits of unwel- 

 come guests, who steal nectar or pollen. (See ^[ 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. 

 The sundew of our 

 swamps has the edges 

 and surface of the leaves covered 



-Sgf? 



Fir.. 386.— Cluster of leaves at the base of flower stalk 

 of Venus' fly-trap {Dioncea muscf/ula). One-half 



natural size.- Alter Drude. 



r ith many outgrowths, 



