OB'QANS OF HEARING. 



327 



face of this membrane are two horny processes (pu), to whicb 

 is attached an extremely delicate vesicle (5i) filled with a 

 transparent fluid, and representing a membranous labyrinth. 

 This vesicle is in connection with an auditory nerve (w) 



Ijing or rnnning. Three legs (Z", i?K 

 i'), are directed forward, while the others (fl', L'^, B"), which are directed back- 

 ward toward the tail, have ended their activity, ad, c d, and ef are curves describerl 

 by the end of the tibise aud passing bacl< to the end of the body; b h, d i, and/ g are 

 carves described by the same legs daring their passive change of position.— After 

 Graber. 



which arises from the third thoracic ganglion, forms a gan- 

 glion {ga) upon the tympanum, and terminates in the im- 

 mediate neighborhood of the labyrinth by a collection of 



