I 
PRIMITIVE PORES OF POLYODON SPATHULA 467 
10 
12 
Fig. 10. Camera lucida drawing of several of the dif- 
erentiated cells of the floor of a primitive pore. The 
drawing was outlined on the table with a Zeiss 2 mm. 
apochromatic objective of 1.30 N.A. and compensating 
eye piece number 6. Drawn by Helen A. Sanborn. 
The second flagellated cell from the right measured 5 
microns from the tip of the cone to the basement mem- 
brane and about 3^ microns through its largest diam- 
eter. The flagellum was barely 2 microns long. The 
cover cell to the right of this flagellated cell extends 
about 1 micron beyond the tip of the cone of the flagel- 
lated cell. Stained with iron hematoxylin. 
Fig. H. A camera lucida drawing made on the table 
to show the relations of the differentiated totheundif- 
erentiated epithelium of a pit. The drawing was made 
after a section stained with Dominici's eosin-orange 
G-toluidin blue, which does not bring out the flagella. These have been added in 
accordance with iron hematoxylin preparations. Zeiss 2 mm. apochromatic 
objective of 1.30 N.A. and compensating eye piece number 6. " Drawn by Helen 
A. Sanborn. 
Fig. 12. Copied from Kistlers's fig. 6, to show his two types of cells. 
