86 
BULLETIN OF THE LABORATORIES 
base of hemisphere, 2-3 mm. posterior to chiasm. Rabbit. Chiefly centripetal 
cells. 
9 - (VI<^-i7rt.) 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 upward through the ganglionic layer. 
Fig. 10. {Nlb-2oa.) Still further back 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 centripetal and centrifugal cells. (See Plate VII, Fig. la. From 
nearly the same area as Plate VII, Fig. 2 ) 
PLATE VII 
C. L. Herrick. 
Fig. I. Section through infundibulum shaded to indicate the distribution 
of centrifugal cells in the cortex. Cephalic surface of a section of right hemis- 
phere. 
Fig. 2. {\ib-20a ) 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. Opossum. Section through entire cortex and hippocampus, trans- 
verse section in front of the anterior commissure. Six layers. I. 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.) 
Fig. 5. Opossum. Section through hippocampus. (No. 33.) 
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 of su- 
perior surface. Corresponding to layer 4, of P'ig. 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 quadrigeminum 
a very short distance back of the preceeding. 
