670 C. JUDSON IIERRICK AND JEANNETTE B. OBf]NCHAIN 



ep. 



s.th.2. 

 s.Th.3. 

 5. mi 



fim. 

 em. th. 



V. 7k 



s. s hp. 

 com.d. 



~\ I I 



7 8 9 



em.fi 



/Sac.d. 



.hab. 



sac.c/. 



e/o.s. 

 com. 5. 

 s.sh. 

 r. pin. 

 com. post 



'Com. pi. 

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^com.pri. 

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7 8 9 10 



I I I L_ 



Fig. 3 Key drawing to accompany figure 4. The principal ventricular sulci 

 are indicated by broken lines. Those portions of the sulcus limitans {f.l.) and 

 the sulcus subhippocampalis (s. .^hp.) which are not evident on the ventricular 

 surface but whose morphological positions can be definitely determined by the 



