I had never seen these before, these are very nice examples. I would even guess that as far as the "swallowtail merlon distribution" goes, this is one of the better matches for the rosettes foldout. That is, walls with swallowtail battlements surround a wide area that contains buildings. Of course in the VM the surrounding walls are rather limited in comparison.
Translated, the site you linked says this about the MSS: "The map of Rome by Fra Paolino da Venezia, friar minor, was included in his Compendium also known as Chronologia Magna completed in 1320. This map is found in 3 manuscripts by Fra Paolino from the first half of the 14th century: l. Venice, Marciana Library, ms. lat. Zan. 399 (1610), fol. 98 (at the end of the ms.); 2. Paris, National Library, Parisin. lat. 4939, fol. 27 (incomplete: there is only the enclosure of the walls, the interior of the city is left blank); 3. Vatican City, Vatican Library, Cod. Vat. Lat. 1960, fol. 270v (at the end of the ms.)."
About the BNF copy, it was apparently made in Naples, see this extensive entry at the BNF site: You are not allowed to view links.
Register or
Login to view.
I've been flicking through it and most of the illustrations appear to be biblical in nature. Its merlons appear "regular", until you reach the final section. There is this city labelled Antiochia:
[
attachment=6028]
And on the next page, Jerusalem, also entirely surrounded with swallowtails: You are not allowed to view links.
Register or
Login to view.
Its map of Rome is unfortunately incomplete and only contains regular merlons.
In the Vatican MS, swallowtail merlons are used similarly, see for example here: You are not allowed to view links.
Register or
Login to view.
There is also an image I don't quite understand here: You are not allowed to view links.
Register or
Login to view.
[
attachment=6029]
Oh I get it, it's a chess board!
I haven't found out yet if the other two MSS were also produced in Naples.