178 



GENERAL ZOOLOGY 



cer 



Lopt. 



S.&X 



Fig 116.— Nervous system of frog showing cranial and spinal nerves and 

 sympathetic system, ventral view. I to X, cranial nerves; cer cerebrum; Lopt 

 optic lobe; n, nasal sac; s, sympathetic system; spc, spinal cord. (Prom btiull, 

 LaRue, and Ruthven, Animal Biology, after Wiedersheim.) 



