THE NERVES OF THE METENCEPHALON. 



99 



h.n. 



FIG. 71. Brain and nerve 

 cord of a new-born scorpion, 

 seen from the haemal surface. 



FIG. 72. First two free bran- 

 chial neuromeres, with the lemma- 

 tochord, spinal ganglia, and spinal 

 nerves for an adult scorpion. 



