PLATE I. 
U.S. B. F.—Doc. 871. 
FIG. 1.—SCALE OF B. TYRANNUS, TAKEN FROM BELOW ORIGIN OF DORSAL 
X 10.4. 
AND A LITTLE ABOVE THE MEDIAN LINE OF THE SIDE. 
FIG. 2—SCALE OF B. AUREUS, TAKEN FROM IDENTICAL POSITION 
AND FROM A SPECIMEN OF THE SAME 
1 
IN FIG. 
X 10.4. 
ON FISH AS 
LENGTH. 
