OF DENISON UNIVERSITY. .S9 



callosum, where the peduncular fibres cross to the thalamus. 



Fig. 2. Cells from the area marked 1 1, in Fig. 6. 



Fig. 3. Cells from the hippocampal region of the ground hog, the ventricle 

 being at the right, the transition into the hipj)ocampus at the left, to show the two 

 varieties of cells at the ventro-caudad part of the posterior cornu. 



Fig. 4. Cells from the fornix body, corresponding to b. Fig. S, Plate II. The 

 cells are .021 mm. long. 



Fig. 5. Brain of a second individual of Arctomys for comparison with Fig. 

 4, Plate V. One-half size. 



Fig. 6. Transverse section of brain of a kitten, at the hippocampal commis- 

 sure. 



Fig. 7. Section of the cortex at 2, in the preceeding figure. 



F'ig. 8. Portions of the superficial, middle and deeper parts of the cortex, 

 adjacent to the corpus callosum in the lobe marked i, in Fig. 6. 



PLATE XIII. 



W. G. Tight. 



Fig^ I. A transverse section of the cervical region at the entrance of the 

 second dorsal nerve root. 



a. Nucleus of ventral cornu. 



b. Xeck of dorsal cornu. 



c. Ventral median column. 



d. Spinal accessory nerve. 

 c. Canalis centralis. 



/. Ventral commissure. 



g. Burdack's column. 



h. Goll's column. 



Fig. 2. A magnified view of the cells from the cervix of the dorsal cornu, 

 Fig. I, b. 



Fig. 3. A magnified view of the motor cells of the ventral cornu, Fig. i. .7. 



Fig. 4. A transverse .section of the cervical region of the cord at the en- 

 trance of the first dorsal and exit of first ventral nerve roots. 



a. Cervix of dorsal cornu. 



b. Ventral cornu nucleus. 



c. Ventrolateral cell-group of ventral cornu. 



d. Median aggregation of cells. 



Fig. :;, Magnified view of cells from neck of dorsal cornu, Fig. 4, <i. 



Fig. 6. Magnified view of ventral median column of cross section of nerve 

 fibres. 



Fig. 7. Magnified view of cross section of nerve fibres from Coil's column, 



Fig. I, D. 



Fig. 8. Magnified view of cells from ventral cornu nucleus, Fig. 4. ^^ 



Fig. 9. Magnified view of cells from the ventrolateral cell group of ventral 



cornu. Fig. 4, c. 



