Lewis & Short

ălōpex, ĕcis, f., = ἀλωπεκίας, a kind of shark, also called, in pure Lat., volpes marina, sea-fox, thresher-shark: squalus vulpes, Cuv.; Plin. 32, 11, 53, § 145; cf.: volpes marinae simili in periculo glutiunt, id. 9, 43, 67, § 145.