Sorry if I have been unclear here, but the issue is not with the Archetypes for the Magus Class. Similar to the way that rogues and ninjas have talents that they can select every few levels, the Magus class has "Magus Arcana" which are more or less the same as a talent from those other classes, but for whatever (confusing) reason, they call them "Magus Arcana". A full list can be found at the d20pfsrd:
https://www.d20pfsrd.com/classes/bas.../magus-arcana/ Examples such as "Accurate Strike (Ex)" "Arcane Cloak (Su)" "Spell Shield (Su)", etc are accredited to the Ultimate Magic Splat Book, but do not appear anywhere in the content of the FG UM Mod. My prior example referring to Archetypes was an example of another reason why I expected these "Magus Arcana" to be available in this module. It had nothing to do with the actual archetypes themselves, as they are clearly available in the "Special Abilities" but was just another reason why I thought the "Magus Arcana" should be a separate list in the "Special Abilities" section - because the text for archetypes specifically call out the fact that some "Magus Arcana" abilities compliment some archetypes better than others. Apologies if this is still not clear, please let me know if I can do anything further to clarify.