The brain of Acipenser. 
101 
possible to recognize in haematoxylin sections any well marked 
division of the tectum into zones of cells and fibres. 
1}; 
/} 
> 
= 
2 
: 
= 
o 
> 
_ 
> 
> 
re 
=) 
= 
_ 
~~ 
= 
a 
| 
