ON THE ORGANS OF HEARING IN INSECTS. 



23 



The annexed sketch may give some idea of the appearance of the 

 trunks and of the manner in which the arms diverge from it. The 

 different numbers indicate the circumferences of the parts respectively, 

 as above enumerated. The limb marked b is that which projects over 

 Bedell's tomb. 



Trunk and lower limbs of Bedell's Tree. 



Killeshandra, Nov. 18, 1833. 



ON THE ORGANS OF HEARING IN INSECTS. 



BY PROFESSOR G. R. TREVIRANUS, OF BREMEN*. 



In the posthumous writings of M. Lyonnet, there is given the 

 anatomy of the sheep tick, which belongs to M. Latreille's genus, 

 Microphthiris. On the forehead of this animal the author discovered, 

 at the place where the antennae of insects are usually situated, two 

 oblong protuberances, covering a hole under a double horny scale, in 

 which lay a rounded body on a short footstalk. This projected from 

 a white fleshy substance, composed of a number of globules, very 

 transparent, and rather hard, the footstalk being fixed by a ligament 

 on the interior of the hole. Lyonnet did not, however, come to any 



* Translated from the German, by Edward Rennie; 



