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Willis (1835) p.29 distinguishes between shafted imposts and banded imposts:
In shafted archways the horizontal section of the upright is different from that of the arch taken immediately above the impost, and generally much plainer...this impost being in fact the commonest of all. In Banded archways, on the contrary, the section of the upright is the same as the section of the arch, so that the shaft appears to pierce and pass though its capital and to be carried over the arch, while the impost mouldings and foliation of the capital appear like a band fastened round the mouldings of a continuous archway; this impost is used nearly to the exclusion of every other in the Gothic of Italy.
At p.119 he again comments that he knows only four exceptions to the rule that in Italy the use of banded imposts is universal: ‘the west doors of S. Lorenzo in Genoa, S. Antonio in Padua, the Baptistery at Parma and S. Antonio in Rome.’
He illustrates them (Willis (1835) Plate III):
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[Version 0.05: May 2008]