ANIMALS AS FOOD, FOES, OF FRIENDS. 



343 



foothold to an insect attempting to crawl out ; or covered by 

 stiff, downward-pointing liairs to oppose its passage ; or the 

 side of the tube is filled 

 with thin translucent spots 

 through which the cap- 

 tives vainly stri\'e to fly, 

 while the real opening is 

 concealed. By one or 

 other of these means the 

 prey is prevented from 

 escaping, and sooner or 

 later is drowned in the 

 liquid. In this liquid 

 digestive enzymes or bac 

 teria quickly dissolve the 

 softer parts of the insect 

 bodies, and the soluble 

 portions are absorbed by 

 the leaf 



(//) The blaJderivort, 

 which abounds in quiet 

 pools, furnishes an ex- 

 cellent illustration of traps Fir,. 382.—^, tmmpet-shaped sessile leaf of .^(jr- 

 , ruLUnia j'ar/c/iir/.f, showing thin membran- 



(flgS. ^S"?, ^84). Upon ^^^ windows in the meshes of the veins of 

 V to* o 01 J -r/ f ^i^g hood which arches over the mouth of the 



the lea\'eS are numerous trumpet. B, cup-sliaped petioled leaf of Xe- 



/'cuthfs Tillosa, with elevated lid and margin 

 minute bladders each ribbed. One-thlrd natural size. — After Kerner. 



with a small opening about which divergent hairs serve as 

 guides to the entrance. The entrance is lightly closed by a 

 flap of membrane, which is readily lifted by minute water 

 animals. After they have passed through the opening the 

 membrane drops behind them, and is stiff enough to prevent 

 their escape. Death ensues sooner or later, and absorbing 

 hairs on the inner face of the trap take up the nutritive 

 materials. 



