A special word to José Espinosa who tracked down and carefully transcribed a great source in Seville. A word, too, to several research assistants who have worked with our team, over time, helping to select, transcribe, and translate sources.A final word to the closest of the closest, my loving family, who endure long absences and profound silences with a smile, who listen repeatedly to my ramblings about whales and dolphins, manatees and mermaids, sharks and sea monsters, and who help me believe in all the possibilities of this fluid world we live in. To