BRAIN 



219 



.ol. 



FIG. 167. BRAIN OF ALLIGATOR. A, dorsal ? B, ventral ; and C, lateral view. 



B.ol, olfactory bulb; G.p, pineal body; HH, cerebellum; Hyp, hypophysis; 

 Jnf, infundibulum ; Med, spinal cord ; MH, optic lobes ; NH, medulla 

 oblongata ; Tro, olfactory tract ; VH, cerebral hemispheres, each of which 

 gives rise postero -laterally to a hippocampal lobe partially overlying the corres- 

 ponding optic tract, Tr.opt ; ZH, diencephalon ; 1-XII, cerebral nerves ; 

 1, 2, first and second spinal nerves. 



