The Spirit Magic entry for the Shaman says:
A shaman can spontaneously cast a limited number of spells per day beyond those she prepared ahead of time. She has one spell slot per day of each shaman spell level she can cast, not including orisons. She can choose these spells from the list of spells granted by her spirits (see the spirit class feature and the wandering spirit class feature) at the time she casts them. She can enhance these spells using any metamagic feat that she knows, using up a higher-level spell slot as required by the feat and increasing the time to cast the spell (see Spontaneous Casting and Metamagic Feats).
If I understand correctly, a Shaman can spontaneously cast only once a day for each spell level, and only from one of her spirit spells?
So a Level 3 Shaman with the Spirit of Battle has one level 1 slot that she can use to "spontaneously" cast Enlarge Person only, and one level 2 slot that she can use to "spontaneously" cast Fog Cloud only?