ORGANS OF HEARING. 



327 



face of this membraue are two horny processes (ow), 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] 



P. 



Fig. 287. A Carabus beetle in the act of walking or running. Three legs (L l , E' s , 

 L a ), are directed forward, while the others (/?', i 2 , -ff 3 ), which are directed back- 

 ward toward the tail, have ended their activity, a b, c if, and tf are curves described 

 by the end of the tibiae and passing back to the end of the body; b fi, <l i, and/ g ale- 

 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 



