up from the darkness right in its path. Dark, and shining like wet rubber, the shape resembled nothing so much as that of a great, double-headed sledge-hammer. From either of the living hammer-heads gleamed a greenish, malignant eye. Before the pollock could dart aside, the great hammer-head shark turned partly over, there was a flash of sharp teeth, and the fugitive fish disappeared.
A second later the ridged, gray, fifteen-foot body shot toward the otter, with such speed that the water fairly hissed from the scimetar-shaped side-fins. The sea otter is among the swiftest swimmers of the mammals, but no air-breathing creature can compete in speed with a shark. Almost instantly the hammerhead was upon her. The jaws of all the sharks are so undershot that, in order to grip their prey, they must perforce turn over on their sides. This peculiarity of their kind was all that saved the otter. For a second the grim head overshadowed her. Then, with a twist of its long tail, shaped like the fluke of an anchor, the shark turned over and the vast mouth swung open, armed with six rows of inch-long, steel-sharp, triangular teeth, whose edges were serrated like a saw. Each separate tooth was curved back toward the gullet, so that for any living thing caught in their dreadful grip there was no more chance of escape than there would be from the interlocking cogwheels of a stone-crusher.
As the jaws of death gaped for the sea otter, with a writhe of her swift body she flashed to one side, while the little cub whimpered in her arms and the fatal
