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. 



