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
After the failure of that attempt, the Carthaginian fleet commanded without a rival the whole western Mediterranean; and their endeavours to occupy Syracuse, Rhegium, and Tarentum, showed the extent of their power and the objects at which they aimed. Hand in hand with these attempts went the endeavour to monopolize more and more the maritime commerce of this region, at the expense alike of foreigners and of their own subjects; and it was not the wont of the Carthaginians to recoil from any violence that might help forward their purpose.
A contemporary of the Punic wars, Eratosthenes, the father of geography (479-560), affirms that every foreign mariner sailing towards Sardinia or towards the Straits of Gades, who fell into the hands of the Carthaginians, was thrown by them into the sea; and with this statement the fact completely accords, that Carthage by the treaty of 406 (6) declared the Spanish, Sardinian, and Libyan ports open to Roman trading vessels, whereas by that of 448,(7) it totally closed them, with the exception of the port of Carthage itself, against the same.
6. Cf. II. VII. Decline of the Roman Naval Power
7. Cf. II. VII. The Roman Fleet
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/3-01-carthage.asp?pg=25