SPECIMENS OF TWO " NIGGERHEADS ” AND ONE "YELLOW SAND SHELL," SHOWING PROPER UTILIZATION OF MATERIAL, EACH OF FORMER 
YIELDING 9 BLANKS AND THE LATTER 28 BLANKS. Natural size. 
5ull. U. S. F.C, 1898. (To face page 310 ) 
Plate 76 . 
