ORGANS OF HEARING. 347 



face of this membrane are two horny processes (ou\ to which 

 is attached an extremely delicate vesicle (bi) filled with a 

 transparent fluid, and representing a membranous labyrinth. 

 This vesicle is in connection with an auditory nerve (n) 



Fig. 292. A Carabus beetle in the act of walking or running. Three legs (L 1 , R*, 

 L 3 ), are directed forward, while the others (R l , L", IP), which are directed back- 

 ward toward the tail, have ended their activity, a b, c </, and ef are curves described 

 by the end of the tibite and passing back to the end of the body; b It, d '/, and/ y are 

 curves described by the same legs during their passive change of position. After 

 Graber. 



which arises from the third thoracic ganglion, forms a gan- 

 glion (go) upon the tympanum, and terminates in the im- 

 mediate neighborhood of the labyrinth by a collection of 



