The Hermaphrodite brig, or brig-schooner, is square-rigged at her foremast like a brig, but without a top forward, and carrying only a fore-and-aft mainsail and gaff topsail on the mainmast. And here it may not be out of place to mention another subtlety: while a barque has three masts, being square-rigged at her fore and main like a ship, and differing from a ship-rigged vessel in having no top at her mizzen, but carrying a fore-and-aft spanker and gaff topsail, yet what is known among sailormen as the "Jackass" barque resembles a barque proper, but has no crosstrees, does not spread lower courses and has no tops.
Illustration and text from Sailing Ships: the Story of their Development from Earliest Times to the Present Day, by Edward Keble Chatterton (1909).