292 



ANATOMY OF VERTEBEATES. 



189 



and after 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, b, 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 Python. The ojitic 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. (f, 



Brain ol a "^ , i ■ • • • i i i • i 



Lizard (iarrrtti are coutractcd at their junction with the hemispheres 

 view^'ccxyr' into the resemblance of ' crura rhinencephali.' 



191 



190 



Bniili ul Tdrlui^o, Ijase view. 



CCVIII. 



Brain oi: Tnrllo iOi,7„„c), upper \lcw. 



CCXVI. 



Tn the base view of tlic brain of the Tortoise, given in fio-. 190 

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



