Report U. S. B. F. 1904. PLATE II. 
FIG. 3.—VENTRAL SURFACE OF A VIRGIN FEMALE, SHOWING THE NARROW, TRIANGULAR 
ABDOMEN. 
FIG. 4.—-VENTRAL SURFACE OF AN OVIGEROUS FEMALE, SHOWING THE BROAD, SEMI- 
CIRCULAR ABDOMEN. 
CALLINECTES SAPIDUS. 
