Bull. U. S. B. F. , 1909. 
Plate XXVII. 
Fig. 3. — Photograph of eleven of the marking buttons after they were recovered from the marked 
fishes. This and the next figure show the corrosion of aluminum 011 the exposed surfaces. 
The buttons are shown natural size. 
Fig. 4. — Photograph of the converse facesof the eleven marking buttons shown in figure 3. 
The buttons have the same relative positions in the two photographs. Reading 
from left to right the numbers of the top row are 75, 76, and 79; of the middle row 80, 87, 
89. and 98: and of the bottom row 97, 123, 124, and 125. Buttons photographed natural, 
size. 
