292 



ANATOMY OF VERTEBRATES. 



189 



and alter a short curve, resolves itself into a close fasciculus of 



olfactory nerves. 



In the Lacertilia, the eyes being relatively larger 

 and more active in function than in Serpents, the 

 optic lobes, fig. 189, &, show corresponding increase 

 of proportional size to other parts of the brain. The 

 cerebellum, ib. c, is still smooth, depressed, semi- 

 circular, and leaves more of the fourth ventricle, e, 

 exposed than in Pytlwn. The optic lobes cease to 

 show the transverse fissure, and form a pair of hemi- 

 spherical hollow bodies. The cerebral hemispheres, 

 ib. a, form an elongate oval body, more contracted 

 anteriorly than in Python. The olfactory lobes, ib. g, 



Lizard (Lacerta are contracted at their junction with the hemispheres 



view! s) C cxvT r into the resemblance of ( crura rhinencephali.' 



191 



190 



Brain of Tortoise, base view, 

 ceviii. 



y 



Bniiu of Turtle (Chelone), upper view. 

 CCXYI. 



In the base view of the brain of the Tortoise, given in fig. 190, 

 the absence of ' pons Varolii ' and of olivary or pyramidal "bodies 



