ORGANS OF HEARING. 827 
face of this membrane are two horny processes (ow), to which 
is attached an extremely delicate vesicle. (7) filled with a 
transparent fluid, and representing a membranous labyrinth. 
This vesicle is in connection with an auditory nerve (7) 
Fig. 28%—A Carabus beetle in the act of isha or running. Three legs (Z}, R?, 
18), are directed forward, while the others (#1, L?, 2%), which are directed back- 
ward toward the tail, have ended their activity. @ 6, c d, and ef are curves described 
by the end of the tibie and passing back to the end of the body; dh, di, and f g are 
a described by the same legs during 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 
