PLATE 2 
EXPLANATION OF FIGURES 
12 Longitudinal section of the posterior terminal portion of the spinal cord of 
the summer flounder, Paralichthys dentatus. Note the large collection and the 
great size of the Dahlgren cells in this region. In many of the cells the nuclear 
material may be seen peripherally arranged about a central core of cytoplasm. 
The ‘terminal enlargement’ of the spinal cord appears here as a cap over the dorsal 
side of the spinal cord proper. Low-power microphotograph. 60. 
13 Cross-section of the spinal cord of the summer flounder, Paralichthys 
dentatus. The ‘terminal enlargement’ appears here as a cap on the dorsal side. 
Five or more of the large Dahlgren cells may be seen in the spinal cord proper. 
A couple of small Dahlgren cells or pieces of cells may be seen in the ‘terminal 
enlargement.’ The Dahlgren cells occupy about one-quarter of the cross-section 
area of the spinal cord. Low-power microphotograph. X 70. 
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