145 



that tlie palaeostriatum following tlie lateral convexity of the brain 

 is curved and not cnt here in its entirely lengtli. In fig. 11 this 

 separation is smaller and in fig. 12 it lias entirely disappeared. 



Olf. h. 



Fig. 9. Sagittal section (rather medial) of the forebrain of a chickembryo 

 of 11 days. 



r. 0. = transition to the recessus opticus. 



b = posterior part of the mesostriatunn or palaeostriatum. 



c = hyperstriatum inferius. 



tó= hyperstriatum superius. 



Fig. 10- Sagittal section of an 11 days chickembryo lateral to fig. 9. 

 d = hyperstriatum superius ; c = hyperstriatum inferius ; 

 b = palaeostriatum augmentatum (= raesostriatum) ; 

 i.p. = tuberculum parolfactorium ; ?'. o. = recessus opticus. 



