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cles with mosquito larvse caught in this way. When 

 the larva is thus caught it never struggles ; the part of 

 the body that is within the utricle seems paralyzed, and 



FIG. 12. UTRICLE, WITH MOSQUITO LAKTA KNCLOSKD. 



the larva dies much sooner than one that is wholly 

 within the utricle ; and this is the more singular from 

 the fact that when the larva is not caught and held in 

 the valve, but has passed through into the utricle, it is 

 quite active for some hours after being caught. If it 

 is caught in the valve, the part that is within the utricle 

 seems perfectly powerless to move, but the part that 

 is outside of the utricle can move and wriggle. And 

 it would seem that when a larva as strong as the mos- 

 quito was caught, with its head and first joint of body 

 sticking out of the utricle, it might escape, but as far 

 as I have observed it never does. 



The chironomus larva (Fig. 13), with its more slen- 

 der body, was not often caught and held in the valve, 

 but occasionally one was caught so. Usually they were 



