544 



NAOKI SUGITA 



species and among these was Mus decumanus (Pall), or Mus 

 norvegicus (Erx.), that is, the Norway rat, the wild form 

 from which the Albino has been derived. He has divided the 

 entire hemispherical surface into twenty-seven areas according 

 to the characteristics of the laminar structure and these are 



\W*\ Upper limbic type. 



WM\ Modified upper limbic type. 



^^ Modified olfactory type. 



^^ Outer olfactory type. 



^B Inner olfactory type. 



I I Extra-limbic type. 



Fig. 10 Cortical areas of rodent's hemisphere' — rabbit— reproduced from the 

 original by Bevan Lewis. 



shown in figure 11 copied from his paper. In figure 11, I have 

 designated with FF, SS and HH the levels at which my sections 

 were taken ; FF, SS and HH being the abbreviations respectively 

 of the frontal, the sagittal and the horizontal sections. 



The following table is from Fortuyn's description of the cortical 

 ceU-lamination of the Norway rat brain. Under the letters desig- 



