SEPTUM, HIPPOCAMPUS, PALLIAL COMMISSURES 433 



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Figs. 11 to 18 Cistudo Carolina. Eight transverse sections of the hemispheres. 

 The right half of each section is drawn from a series stained with a cell stain, 

 the left half from a Weigert series. Owing to variation between individuals and 

 to slight differences in the plane of section the outlines of the two halves do not 

 agree perfectly, but the right and left sides are substantially equivalent. The 

 drawings were made under the Edinger apparatus. On the right side each cell 

 is represented by an ink dot. The number and grouping of the cells are accu- 

 rately shown, the relative size fairly well. Magn. 13 diam. 



Fig. 11 Section through the olfactory peduncle and the caudal border of the 

 formatio olfactoria. It shows the two ventricular sulci separating from one 

 another in front of the peduncle (compare fig. 19). Between the two is the pri- 

 mordium hippocampi and above this the rostral end of the hippocampus. 



Fig. 12 Section in the caudal part of the peduncle showing the two ventricu- 

 lar sulci close together. 



Figs. 13 and 14 Successive sections farther caudad. The sulcus limitans 

 between the area parolfactoria and the primordium is better marked than that 

 (s. f-d.) between the primordium and hippocampus. 



