I have a level 1 Synthesist Summoner.

Since he has the Quadruped base Eidolon, when fused, my Summoner has a bite attack (Primary). In addition, I have spent evolution points on a tentacle (Secondary). Finally, my Synthesist carries around an Axe, with which he can make weapon attacks.

If I were to use the Full-Attack option, what attacks could I make, and at what penalties? Let's assume I want to always use the Axe, where possible.

How does this interact with the eidolon's natural attack limit? (3 at first level)