ANSWER
Two different species of mice migrated to the river from different directions.
EXPLANATION
Solved scientifically in my head.
The "inward eye" refers to the mind recalling an image. He's saying that while he lays on his couch he sees the daffodils in his mind; using his memory of what he had seen.
Answer:
I would say the 2nd or 4th option but its definitely not the first.