IN SECT I VOROUS PLANTS. 



57 



The valve is attached on all sides to the bladder, excepting by its 

 posterior margin, which is very thin, and rests on a collar or rim, 

 which dips deeply into the bladder. The valve can only open in- 



FiQ. 9. Utriculaeia neglecta. Branch with the dfvided leaves bearing bladders; about 



twice enlarged. 



ward; there are on its surface numerous glands, which have the 

 power of absorption, but are not known to secrete. 



The whole inner sui'face of the bladder is covered with a serried 

 mass of processes, consisting each of four divergent arms, whence they 



Fig. 10. UtbiculariA neqleota. Bladder, much enlarged. 



are called quadrifid processes. Each arm generally contains a minute, 

 faintly-brown particle, either rounded or elongated, which shows in- 

 cessant Brownian movements. 



Whenever found in stagnant water the bladders swarm with in- 



