ORGANS OF HEARING. 



327 



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. 287. A Carabus beetle in the act of walking or running. Three legs (Z, R*, 

 L a ), are directed forward, while the others (#, Z", X 3 ), which are directed back- 

 ward toward the tail, have ended their activity, ab, erf, and ef are curves described 

 by the end of the tibiae and passing back to the end of the body; bh,di, and/ g 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 



