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
The senate passed over what had taken place in silence, and ordained that the two surviving testamentary heirs should have the kingdom equally divided between them, and that, for the prevention of fresh quarrels, the division should be undertaken by a commission of the senate.
This was done: the consular Lucius Opimius, well known through his services in setting aside the revolution, had embraced the opportunity of gathering the reward of his patriotism, and had got himself placed at the head of the commission.
The division turned out thoroughly in favour of Jugurtha, and not to the disadvantage of the commissioners; Cirta (Constantine) the capital with its port of Rusicade (Philippeville) was no doubt given to Adherbal, but by that very arrangement the portion which fell to him was the eastern part of the kingdom consisting almost wholly of sandy deserts, while Jugurtha obtained the fertile and populous western half (what was afterwards Mauretania Caesariensis and Sitifensis).
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=31