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 (ri) 



Fig. 292 A Carabus beetle in the act of walking or running. Three legs (V, IP, 

 Z 3 ), are directed forward, while the others (E\ X 2 , # 3 ), which are directed back- 

 ward toward the tai 1, have ended their activity. ab,cd, and ef are curves described 

 by the end of the tibia? and passing back to the end of the body; b h, d i, and/ a are 

 curves described by the same legs daring 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 



