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
Considerable room was thus always left for the exercise of the censorial right of election; but those senators who were chosen not in consequence of having held office, but by selection on the part of the censor--frequently burgesses who had filled a non-curule public office, or distinguished themselves by personal valour, who had killed an enemy in battle or saved the life of a burgess--took part in voting, but not in debate.(24)
24. Cf. II. III. Complete Opening Up of Magistracies and Priesthoods
The main body of the senate, and that portion of it into whose hands government and administration were concentrated, was thus according to the Ovinian law substantially based no longer on the arbitrary will of a magistrate, but indirectly on election by the people. The Roman state in this way made some approach to, although it did not reach, the great institution of modern times, representative popular government, while the aggregate of the non-debating senators furnished--what it is so necessary and yet so difficult to get in governing corporations--a compact mass of members capable of forming and entitled to pronounce an opinion, but voting in silence.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=57