1915] BRIEFER ARTICLES 333 
larly scattered over the surface are small round subhyaline spots, 
evidently representing perforations of the tissue. These are usually, 
but not always, in pairs. I suppose that they represent the work of 
some insect, but what one, I am quite at a loss to imagine. 
The fossil was collected by Mr. Gro. N. RoHWER, at Station 14, in 
the Miocene shales of Florissant, Colorado—T. D. A. CocKERELL, 
University of Colorado, Boulder. 
