Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Two dead things and two bloods have been made lawful for us. The two dead things are fish and locusts, and the two bloods are the liver and the spleen."
(b) Zayd bin Aslam narrates from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both): "Two dead things have been made lawful for us."
This (latter, mawquf version) is the correct one.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيد والذبائح / 18997