U. S. B. F.—Doc. 871. PLATE I. 

FIG. 1—SCALE OF B. TYRANNUS, TAKEN FROM BELOW ORIGIN OF DORSAL 
AND A LITTLE ABOVE THE MEDIAN LINE OF THE SIDE.  X 10.4. 

FIG. 2—SCALE OF B. AUREUS, TAKEN FROM IDENTICAL POSITION 
ON FISH AS IN FIG. 1, AND FROM A SPECIMEN OF THE SAME 
LENGTH.  X 10.4, 
