Dealfish

(Ichth.) A genus of fishes ( Trachyp terus ) of the ribbon-fish family, having a body very much compre ed, with a dorsal fin extending the entire length of the back. The tail fin rises almost vertically from the horizontal line of the back-bone, as though dislocated and reset at a right angle. The D.-f. is large in size, from 5 to 8 feet long, and is apparently a deep-sea fish, though frequently appearing on the shores of Norway, Iceland and northern Ireland.