I'd probably agree - but then our idea of the use of some table ware items has changed vastly since the 1870s. As you say, just for a single sitting and then washed presumably ready for the next 'tea time' ................ similar to the use of unlidded jam/preserve dishes, where sufficient for simply one meal was put out. It's always possible that some named descriptions may have been more local than we might think - but as already mentioned, S.&F. use only the words 'jellies/sweetmeats'.
Probably completely unrelated, but you could be forgiven for thinking this round handled shallow dish shape had its origins in chamber sticks, which at a quick look appear similar.