86 BULLETIN OF THE LABORATORIES 



base of hemisphere, J-3 mm. posterior to chiasm. Rabbit. Chiefly centripetal 

 cells. 



Fig. 9. [Wd-x'ja.) From a transverse section a short distance posterior to 

 infundibulum. The portion figured lies about 12 mm. from the median line and 

 extends from the white matter ujnvard through the ganglionic layer. 



Fig. 10. (VI^-20<7.) Still further l:)ack near the middle of the exposed part 

 of the cortex. The portion figured supplements Fig. 9, covering the upper part 

 of the cortex to below the giant cells. Drawn to a scale without camera. A 

 mixture of ceiitripetal and centrifugal cells. (See Plate VH, I-^ig. la. From 

 nearly the same area as Plate VII, Fig. 2 ) 



PLATE VII. 

 C. L. Herrick. 



F?g. I. Section through infundibulum shaded to indicate the distribution 

 of centrifugal cells in the cortex. Cephalic surface of a section of right heinis- 

 phere. 



Fig. 2. (Vr/'-jOcz ) Porion of a section through the pyriform lobe, exhib- 

 iting the centripetal variety of cells unmixed with centrifugal. At the lower 

 curvature, however, both varieties occur, x about 165. 



Fig. 3. Portion of the same section near the middle of the arc of the upper 

 surface in <an area where both varieties of cells are commingled. 



Fig. j^. Opossum. Section through entire cortex and hippocampus, trans- 

 verse section in front of the anterior commissure. Six layers. L Neuroglia 

 layer. II First nucleary zone, cells about .03 long, in the upper part fusiform, 

 below pyramidal. Ill, First granulary layer. IV. Giant cells .04-. 045 long. 

 V. Imperfect second granular layer. VI. Transition zone. VII. Fiber zone. 

 (Slide 19.) 



F/g-. ^. Opossum. Section through hippocampus. (No. ^^.) 



Fig. 6. Opossum. ^ mm. in front of crucial sulcus and a little nearer the 

 median side than the external. Deep layer of cells. 



Fig. 7. Opossum. Slide 22. Deep cortical layer toward lateral '^4 of su- 

 perior surface. Corresponding to layer 4, of Fig. 4. Giant cells. Section 

 transverse and just in anterior part of anterior commissure. Cells about .04 

 mm. long. 



Fig. 8. Opossum. Slide 79. Longitudinal section near middle of hemis- 

 phere, half way between crucial sulcus and front giant cell layer. 



PLATE VIII. 

 C. L. Herrick. 



Fig. I. Section through one-half the thalamus just back of the infundibu- 

 lum. 



Fig. 2. Similar section through the anterior part of corpus c[uadrigeminum 

 a very short distance back of the preceeding. 



