This seal shows an agrimi, the Cretan wild goat. Evans purchased it near Rethymnon while travelling around Crete.
Bibliography
Evans, Arthur. 1921. The Palace of Minos at Knossos, I, p. 204, fig. 274s
Evans, Arthur. 1935. The Palace of Minos at Knossos, IV, p. 500, fig. 439
Myres, John (ed.). 1936. British Archaeological Discoveries in Greece and Crete 1886-1936, p. 28
Hughes-Brock, Helen and Boardman, John. 2009. Corpus of Minoan and Mycenaean Seals VI: Oxford, the Ashmolean Museum, no. 178