72 KANSAS ACADEMY OF SCIENCE. 
Transactions Kansas Academy of Science, Vol. XVII. PLATE II. 
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‘of it in focus at a time to make a very satisfactory drawing of it; but I have done 
the best I could. 
The upper edge seems to be hidden under some kind of trash, which, if it 
were away, might reveal the border, which would establish whether it was C. 
lacustris or not; still, I have little doubt that it is, or of that family. When 
best adjusted, the hexagons appeared somewhat dark, with a round, white dot 
in the center of each, as on the right of the figure; but, by adjusting up a very 
little, the white circles disappeared, and were replaced by small, black dots, like 
those of Triceratium favus, as seen on the left. 
One of the most curious things found had no particular color beyond a slight 
smoky tint, and the central part was raised up into a sort of boss or umbo, in 
the center of which there was a rather dark-blue spot, in which were usually two 
grains of something like black sand, though sometimes only one. Some are 
much more regular in outline, as well as larger than the one I made the drawing 
from (fig. 12, pl. II); and they are moderately plentiful, say two to five in a half- 
