This seal shows a bull caught in a net. There are a number of examples of nets used to catch cattle in Aegean Bronze Age iconography, notably on a gold cup from Vapheio in mainland Greece.
Bibliography
Myres, John (ed.). 1936. British Archaeological Discoveries in Greece and Crete 1886-1936, p. 29
Hughes-Brock, Helen and Boardman, John. 2009. Corpus of Minoan and Mycenaean Seals VI: Oxford, the Ashmolean Museum, no. 408