. Fishes. Fishes. Adaptations of Fishes 71 they die. If lifted out of the water, the slimy hagfish at once slips out and swims quickly away. In gill-nets in Monterey Bay great mischief is done by hagfish {Pol-istotrema stouti). It is a curious fact that large numbers of hagfish eggs are taken from the stomachs of the male hagfish, which seems to be. Fig. 53.—Hagfish, Polistotrema stouti (Lockington). almost the only enemy of his own species, keeping the numbers in check. The Swordfishes.—In the swordfish and its relatives, the sail- fish and the spearfish, the bones of the anterior part of the
. Fishes. Fishes. Adaptations of Fishes 71 they die. If lifted out of the water, the slimy hagfish at once slips out and swims quickly away. In gill-nets in Monterey Bay great mischief is done by hagfish {Pol-istotrema stouti). It is a curious fact that large numbers of hagfish eggs are taken from the stomachs of the male hagfish, which seems to be. Fig. 53.—Hagfish, Polistotrema stouti (Lockington). almost the only enemy of his own species, keeping the numbers in check. The Swordfishes.—In the swordfish and its relatives, the sail- fish and the spearfish, the bones of the anterior part of the head are grown together, making an efficient organ of attack. The sword of the swordfish, the most powerful of these fishes, has been known to pierce the long planks of boats, and it is supposed that the animal sometimes attacks the whale. But stories of this sort lack verification. The Paddle-fishes.—In the paddle-fishes (Polyodon spatula and Psephunis gladius) the snout is spread out forming a broad paddle or spatula. This the animal uses to stir up the mud on the bottoms of rivers, the small organisms contained in mud constituting food. Similar paddle-like projections are developed in certain deep-water Chimasras (Harrioitia, Rhino- chimcBra), and in the deep-sea shark, Mitsuktirina. The Sawfishes.—A certain genus of rays {Pristis, the saw- fish) and a genus of sharks {Pristiophorvis, the saw-shark), pos- sess a similar spatula-shaped snout. But in these fishes the snout is provided on either side with enamelled teeth set in sockets and standing at right angles with the snout. The animal swims through schools of sardines and anchovies, strikes. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jordan, David Starr, 1851-1931. New York, H. Holt and Company
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