1. Balistes Capriscus;
2. Cottus Diceraus;
3. Naseus Fronticornis.
According to Pliny (viii. 38) the dolphins which enter the Nile are armed with a knife-edged spur on the back to protect themselves from the crocodiles. Cuvier refers this allusion to the Squalus centrina or Spinax of Linnæus. The European ‘file-fish’ (Balistes capriscus), found in a fossil state, and still existing, though rare in British waters, remarkably shows the efficiency, beauty, and variety of that order’s armature. It pierces its enemy from beneath by a strong erectile and cirrated spine on the first anterior dorsal; the base of the spear is expanded and perforated, and a bolt from the supporting plate passes freely through it. When the spine is raised, a hollow at the back receives a prominence from the next bony ray, which fixes the point in an erect position. Like the hammer of a fire-piece at full cock, the spear cannot be forced down till the prominence is withdrawn, as by pulling the trigger. This mechanism, says the learned and experienced Professor Owen,[31] may be compared with the fixing and unfixing of a bayonet: when the spine is bent down it is received into a groove in the supporting plate, and thus it offers no impediment to swimming.
Fig. 4.—1. Spear of Narwhal; 2. Sword of Xiphias; 3. Rhinoceros-Horn; 4. Walrus Tusks.
Fig. 5.—Narwhal’s Sword Piercing Plank.
Fig. 6.—Metal Daggers with Horn Curve.
The pugnacious and voracious little ‘stickleback’ (Gasterosteus) is similarly provided. The ‘bull-head’ (Cottus diceraus, Pallas[32]) bears a multibarbed horn on its dorsum, exactly resembling the spears of the Eskimos and the savages of South America and Australia. The yellow-bellied ‘surgeon’ or lancet-fish (Acanthurus) is armed, in either ocean, with a long spine on each side of the tail; with this lance it defends itself dexterously against its many enemies. The Naseus fronticornis (Lacépède) bears, besides the horn-muzzle, trenchant spear-formed blades in the pointed and serrated tail. The sting-fish or adder-pike (Trachinus vipera) has necessitated amputation of the wounded limb: the dorsals, as well as the opercular spines, have deep double grooves in which the venomous mucous secretion is lodged—a hint to dagger-makers. The sting-rays (Raia trygon and R. histrix[33]) twist the long slender tail round the object of attack and cut the surface with the strong notched and spiny edge, inflicting a wound not easily healed. The sting, besides being poisonous, has the especial merit of breaking off in the wound: it is extensively used by the savages of the Fiji, the Gambier, and the Pellew Islands, of Tahiti, Samoa, and many of the Low Islands.[34] These properties would suggest poisoned weapons which cannot be extracted. Such are the arrows of the Bushman, the Shoshoni, and the Macoinchi of Guiana, culminating in the highly-civilised stiletto of hollow glass.
