Both please? This reminds me, in the case of Lassus, we have one of the truly monumental collections, the Magnus opus musicum. It would not be sane or sensible to split it over 500 separate works pages — even if we end up with works pages from the Breitkopf und Härtel set. On the other hand, that page has been accreting extra typesets which I believe should be on separate pages (especially if they were not first published in the 1604 set, but published earlier in one of Lassus’s many other publications).
Back to the Bateson. If we have a typeset of the entire book – put it on a publication page for the first book. Only if the items are easily separable without lossage, should splitting it be considered. If we have a separate typeset for Dame Venus, then it goes on its own page.