240 



in Chimaera must be regarded as two parts of the tractus pallii. 

 That one of the bundles should reach far forward and bend down a- 

 round the rostral end of the brain is to be explained by the pulling 



Fig. 22. 



Fig. 23. 



Fig. 24. 



forward of the olfactory bulbs. This has resulted in part in the great 

 elongation of the telencephalon medium ("praethalamus") and in part 

 in the rotation forward and downward of a massive roof similar to that of 

 the selachian brain. In Chimaera the membranous roof extends forward 



