Callinectes sapidus. 3. Ventral surface of a virgin female, showing the narrow triangular abdomen. 4. Ventral surface of an ovigerous female, showing the broad, semicircular abdomen. In: "Life History of the Blue Crab (Callinectes Sapidus" by W. P. Hay. Report of the Bureau of Fisheries 1904. P. 413, Plate II.