Rank Structure of the Late Roman Legions

[D B Campbell]

Now it's the lower ranks that get me. ... I should have amended my question earlier to ask what were the enlisted ranks of the Roman legions. This is what I'm interested in but can't seem to find.

A good place to start for many Late Roman questions is A.H.M. Jones, [amazon]The Later Roman Empire 284-602[/amazon]. Although published in 1964, it is still valuable for many topics, and includes a chapter on the army.

... a private (pedes) or trooper (eques) might in due course be promoted to the grade of semissalis and then to non-commissioned rank. ... In the new types of formation dating from the third and fourth centuries, the vexillations and the auxilia and the scholae, the grades were ... in ascending order circitor, biarchus, centenarius, ducenarius, senator, primicerius.