Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Constitution of Carthage - Council - Magistrates
Aristotle, who died about fifty years before the commencement of the first Punic war, describes the constitution of Carthage as having changed from a monarchy to an aristocracy, or to a democracy inclining towards oligarchy, for he designates it by both names. The conduct of affairs was immediately vested in the hands of the Council of Ancients, which, like the Spartan gerusia, consisted of the two kings nominated annually by the citizens, and of twenty-eight gerusiasts, who were also, as it appears, chosen annually by the citizens.
It was this council which mainly transacted the business of the state-making, for instance, the preliminary arrangements for war, appointing levies and enlistments, nominating the general, and associating with him a number of gerusiasts from whom the sub-commanders were regularly taken; and to it despatches were addressed. It is doubtful whether by the side of this small council there existed a larger one; at any rate it was not of much importance.
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Reference address : https://www.ellopos.net/elpenor/rome/3-01-carthage.asp?pg=26