ORGANS OF HEARING. 



327 



face of this membrane are two horny processes (oti), 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) 



P.. 



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

 Z 3 ), are directed forward, while the others (R l , L-, Ii*), which are directed back- 

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

 by the end of the tibias and passing back to the end of the body; b h, d i, and/ cj 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 



