Portonaccio battle sarcophagus 'standard'?

[Ross Cowan]

I've been uploading some old pics of Roman military equipment and related pieces to Flickr. According to Stoll and Töpfer (p. 375), this curious object (beside the eagle) on the Portonaccio Battle Sarcophagus is a corona muralis mounted on a pole, but I can't think of another representation of a military crown with a roof. Could it be something like a portable shrine (cf. the aedicula of Felsonius Verus)?



Another angle:



Cheers,

R!