AMPHIBIA. 63 



2. Optic lobe, from which more has been removed than in the preceding figure. 



3. Cerebellum, from which more has been removed than in the preceding figure ; 



two longitudinal bands are continued on from the base of the optic lobes, 

 and terminate near the calamus scriptorius, by being implanted into the 

 anterior portion of the oblong medulla; on each side of these, others less 

 distinct may be observed. 



4. Fourth nerve. 



FIG. III. 



(THE SAME.) 



1. OPTIC tract, principally derived from the thalamus, but also communicating 

 with the optic lobe. 



. Crus of the brain passing above the optic tract, but communicating somewhat 

 with it and the part surrounding the infundibulum. 



FIG. IV. 



(THE SAME.) 



A PORTION of the optic nerve has been removed ; the cms of the brain is seen 

 passing from the anterior lobe to the oblong medulla. 



