Catalan Zodiac Rose S.XV

[oshfdk]

I am a bit puzzled with some characters, mainly the g very simmilar to the Voynich. For example saturn, the planet for Capricorn and Aquarius. In Capricorn it is written "saturnus", but in Aquarius is written "saturiag". The "g" appeara also at the outer ring, at the low left position (november), where you have "filig" and oposite of this, at the top right position (below maig may) we have "filia". There are other words ending with this "g". 

Anybody knows what this character "g" stands for?

I'm not sure why it's saturiag and not saturng, but I guess g stands for -us, similar to the following quire mark from the Voynich MS (which should read primus, as far as I understand).

   

I'm not an expert in these, but it appears there used to be dozens of common scribal abbreviations like this and hundreds of more obscure ones. There are people on this forum who know about this much more than I do.