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1. Shmuel: Rav maintains that one sheep in the middle does combine (see above, Daf 54, #5) if there are nine sheep on each side.
2. Rav Papa: Shmuel does not require any sheep in the middle.
3. There is a discussion about Rebbi Meir's reasoning (54b) for why the Jordan River is considered a separation between two groups of sheep for Ma'aser Behemah.
4. There is a discussion about whether the Jordan River is part of Eretz Yisrael.
5. Rebbi Meir: The river known as Peras is actually called Yuval.
A BIT MORE
1. He arrives at this conclusion based on a question from a Beraisa that clearly states that one sheep in the middle combines the sheep on the sides.
2. As long as the shepherd, or even his vessels, are within sixteen Mil of each group of sheep, they combine. Rav Ashi is unsure about whether the presence of the shepherd's sheep-dog in that area is enough to cause the groups to combine.
3. Rebbi Ami: The river acts as a separation between the two groups of sheep, unless there is a bridge enabling them to cross the water. Rebbi Chiya bar Aba: A verse states that the Jordan River is a separation.
4. Rebbi Yehudah ben Beseirah: It is not part of Eretz Yisrael, as the verse implies, "When you cross the Jordan on your way to the land of Kena'an." Rebbi Shimon ben Yochai: It is part of Eretz Yisrael, as the verse implies, "across the Jordan, in Yericho." Just as Yericho is in Eretz Yisrael, the Jordan River is also in Eretz Yisrael.
5. It is called Peras because its waters are fruitful and multiply ("Parim v'Ravim").
Next Daf Index to Revach for Maseches Bechoros