Bull. U. S. B. F. , 1909. 
Plate XXVI. 
Fig. 1. — The two pieces of the marking button are shown in A and B, the former especially 
arranged to show the rivet, the latter to show the shaft. In C the two pieces are shown 
put together but not riveted. In D the parts are riveted together, and in K the converse 
side is figured. 
Fig. 2. — Pliers used in attaching the marking buttons. 
