170 



COMPARATIVE ANATOMY 



ME ZE- 

 Eyf- 



NE 



m ™ 



Fi<i. 140. — Bkain of Alligator. (A, dorsal; B, ventral; and C, lateral view. ) 



VH, cerebral hemispheres, each of which gives rise postero-laterally to a hippo- 

 campal lobe partially overlying the ooi'responding optic tract, Tr.opt ; ZH, 

 thalamencephalon ; MH, optic lobes ; HH, cerebellum ; NH, medulla 

 oblongata ; J-XII, cranial nerves ; 1,2, first and second spinal nerves ; B.ol, 

 olfactory bulb ; Tro, olfactory tract ; G.p, pineal body ; Jnf, infundibulum ; 

 Hyp, hypophysis ; Med, spinal cord. 



