[31] Multa flavus arena is a specific description of the Tiber, which is constantly called ‘flavus,’ Hor. 1 Od. 2. 13., 8. 8., 2. 3. 18. Comp. 9. 816. Gossrau remarks that Ov. F. 6. 502 mentions the ‘vertices’ at the mouth of the Tiber. ‘Verticibus rapidis’ may be either modal abl. or constructed with ‘flavus.’ In any case the line seems to qualify ‘prorumpit.’