304 
BULLETIN OF THE UNITED STATES FISH COMMISSION, 
EXPLANATION OF PLATE XLVIII. 
Figs. 29 and 30. Views of the upper surfaces of the heads of recently killed females of the common 
sturgeon, show iug variations. From photographs. 
Fig. 31. View of the upper surface of the head of the adult male of the common sturgeon, showing the 
more gently tapering and blunter form of the snout, with relatively less width at the base 
of the cranium. From a photograph. 
