INTELLIGENCE AND BRAIN PATTERN 



19 



area or somatic-sensory lobes are prominent, while the facial and 

 vagal lobes make no j)rominent elevation ; in the carp the skin 

 area is small, but both the facial lobe and vagal lobes produce well- 

 marked prominences. In the diagram it is clearly seen that all 

 the sensory centres, namely the olfactory lobes, optic lobes, acoustic 



TO/>i 



PLATE 2. 

 V4LC. CLM 



ON 



M'V. Pir sv 



Brain of Cod in sagittal section. 



T0/>|- V/\L.C 



L.IIVF 



o:n' ••■ «v 



Brain of Carp in sagittal section tlirough the middle of a vagal lobe. 



OLF — Olfactory tract. P — Pallium. CS. — Corpus striatum. T.Opt. — Tectumi 

 opticum. Val.C. — Valviila cerebelli. CLM — Cerebellum. SS — Somatic-sen- 

 sory lobe. LF — Lobus facialis. LV — Lobus vagalis. ON — Optic nerve. 

 PEB — Primitive end-brain. Pit. — Pituitary gland. SV — Saccus vasculosus. 

 L.IXF. — Lobus inferior. III.V. — Third ventricle. IV. Vent. — Fourth ventricle, 



tubercles, the somatic-sensory lobes and the facial and vagal lobes 

 are situated dorsaUy. Situated ventrally, are several im2)ortant 

 bodies ; posteriorly the first enlargements are too well marked 

 lobes, the lobi inferiores, in front of which lies the saccus vasculosus. 

 Then comes the pituitary body or gland wliich in recent years has 

 been recognised as an organ of great importance ; immediately in 

 front of this the optic nerves will be seen to decussate. 



