In la Harpe's map, Galveston Island is not given a name but is easily identifiable. According to the Handbook of Texas Online, la Harpe's ship, Subtile, had been destined for Matagorda, winding up in Galveston Bay only by mistake.
The lack of a name for Galveston Island on la Harpe's map is contrasted with its clear identification. The Handbook of Texas Online explains that la Harpe's ship, the Subtile, was intended for Matagorda but ended up in Galveston Bay by mistake.