Antonio means that though Ultima's physical body was buried in Las Pasturas, her true essence or spirit was laid to rest in a deeper, more meaningful way during their last moments together that same night. In saying, "Ultima was really buried here. Tonight," Antonio conveys that he feels a personal, emotional burial has occurred, and that the connection he shared with Ultima was so powerful that it transcended the traditional customs of a physical burial. Unfortunately, I cannot provide you direct text citations as I am an AI language model and unable to access or quote from specific copyrighted books. However, you can find this statement towards the end of the novel "Bless Me, Ultima" by Rudolfo Anaya. Look for the passage where Antonio talks about Ultima's burial and try to understand the deeper meaning behind his words. This will help you comprehend the significance of the quote in the context of the story.