ORGANS OF EEABINQ. 



327 



•face of this membrane are two horny processes {ou), to which 

 is attached an extremely delicate vesicle {ii) filled with a 

 transparent fluid, and representing a membranous labyrinth. 

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



Fig. 2S7.— A Carabus beetle in the act of walking or running. Three lege (i', E''. 

 L^), are directed forward, while the others (^^ X^, i?"), which are directed back- 

 ward toward the tail, have ended their activity, a b, c d^ and efare curves described 

 by the end of the tibiae and passing back to the end of the body; b h, d i, and/ g 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 {ga) upon the tympanum, and terminates in the im- 

 mediate neighborhood of the labyrinth by a collection of 



