76 



CONVOLUTIONS OF THE BRAIN 



very marked feature, moreover, of the mammal's brain is the 

 development of regular fissures upon its surfiice, which fissures 

 are only absent from Ornitlwrhyiiclius, various small Eodents, 



r.—B.or 



Fig. 49. — Braiu of Dog. A, ventral ; E, dorsal ; C, lateral aspect. B.ol, Olfactory lobe ; 

 Cr.ce, crura cerebri ; J^i.p, great longitudinal fissure ; IJJI, HII^, lateral lobes of 

 cerebellum ; 7/i/p, hypophysis ; J/rd, spinal cord ; Nil, medulla oblongata ; Po, 

 pons Varolii ; VH, cerebral hemispheres ; ll'v/, middle lobe (vermis) of cerebellum ; 

 I-XII, cerebral iierves, (From "Wiedersheim's Ciri}qiorafive Anatmny.) 



Bats, and Insectivores, among living mammals. It is some- 

 times, but erroneously, said that the more complicated the 

 fissures of the brain are, the higher in intelligence and " zoological 

 position " is the possessor of that brain. Instances can un- 

 doubtedly bi' quoted to support such a view ; but they are 



