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
We recognize here the jealousy of the dominant maritime power, gradually increasing with the extension of the Roman dominion along the coasts.
Carthage compelled the Romans to acquiesce in her prohibitive system, to submit to be excluded from the seats of production in the west and east (connected with which exclusion is the story of a public reward bestowed on the Phoenician mariner who at the sacrifice of his own ship decoyed a Roman vessel, steering after him into the Atlantic Ocean, to perish on a sand-bank), and to restrict their navigation under the treaty to the narrow space of the western Mediterranean--and all this for the mere purpose of averting pillage from their coasts and of securing their ancient and important trading connection with Sicily.
The Romans were obliged to yield to these terms; but they did not desist from their efforts to rescue their marine from its condition of impotence.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=63