Astacus n. (Zool.) A genus of crustaceans, containing the crawfish of fresh-water lobster of Europe, and allied species of western North America. See Crawfish.
... and a device woundeth not. And, indeed, as for the night that thou tellest to be on his shield, haply it signifieth the night of death that shall fall upon his eyes. Over against him will I set the son of Astacus, a brave man and a modest. Also he is of the race of the Dragon's Teeth, and men ... — Stories from the Greek Tragedians • Alfred Church