OBOANS OF HEARING. 



347 



face of this membrane are two hoi-ny processes {ou), to which 

 IS attaclied an extremely delicate vesicle [li) filled with a 

 transparent iluid, and representing a membranous labyrinth. 

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



Fiff 292 —A Carabus beetle in the act of walking or running. Three legs {L\, B\ 

 T?\ are directed forward, while tiie others (if>, i^ S'), which are directed back- 

 ward toward the tail, have ended their activity. ab,cd and «/ are curves described 

 bv the end of the tibise and passing back to the end of the body; * A, d e, andy o 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 



