£06 UTRIOULARIA NEGLEOTA. Cuar. XVII 
fits, I may mention that my son found a Daphnia 
whicn had inserted one of its antenne into the slit, 
and it was thus held fast during a whole day. On 
three or four occasions I have seen long narrow larve, 
both dead and alive, wedged between the corner of 
the valve and collar, with half their bodies within the 
bladder and half out. 
As I felt much difficulty in understanding how such 
minute and weak animals, as are often captured, 
could force their way into the bladders, I tried many 
experiments to ascertain how this was effected. The 
free margin of the valve bends so easily that no 
resistance is felt when a needle or thin bristle is 
inserted. A thin human hair, fixed to a handle, 
and cut off so as to project barely + of an inch, 
entered with some difficulty; a longer piece yielded 
instead of entering. On three occasions minute par- 
ticles of blue glass (so as to be easily distinguished) 
were placed on valves whilst under water; and on 
trying gently to move them with a needle, they disap- 
peared so suddenly that, not seeing what had happened, 
I thought that I had flirted them off; but on ex- 
amining the bladders, they were found safely enclosed. 
The same thing occurred to my son, who placed little 
cubes of green box-wood (about ;4, of an inch, ‘423 
mm.) on some valves; and thrice in the act of placing 
them on, or whilst gently moving them to another 
spot, the valve suddenly opened and they were en- 
gulfed. He then placed similar bits of wood on other 
valves, and moved them about for some time, but they 
did not enter. Again, particles of blue glass were 
placed by me on three valves, and extremely minute 
shavings of lead on two other valves; after 1 or 2 hrs. 
none had entered, but in from 2 to 5 hrs. all five 
were enclosed. One of the particles of glass was & 
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