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DECUSSIS.-The name of an early Roman brass coin, a multiple of the as.  The value of ten asses was assignbed to the decussis, at the time when the as libralis was established.  But the as was changed under the dictatorship of Q. Fabius, and continued in a course of diminution until the passing of the lex papiria, which authoritatively fixed the decussis of brass, and the denarius of silver, at 16 semi-uncial asses. (See Assis diminutio, p. 85, et seq. of this dictionary)-These pieces, which are of the highest rarity, bear on one side the galeated (helmeted) head of Minerva; on the other the prow of a vessel; and are  marked with the sign X.  One of them is stamped ROMA, and has the type of Victgory in a biga. - Hennin-Mionnet. - See Denarius.