Ox-rays (UROGYMNUS ASPERRIMUS) grow to a great size, their backs being so armoured with thick-set stellate bucklers on a horn-like skin, that to secure them a heavy-hefted weapon and a strong right arm are necessary. But among the largest of the family is that known as the devil fish (MOBULA sp.), which, upon being harpooned, sinks placidly to the bottom, and adhering thereto by suction, defies all ordinary attempts to raise it. This often basks in calm water or swims slowly close to the surface, when the pliant tips of its "wings," appearing at regular intervals above the surface, create the illusion of a couple of large sharks moving along in rhythmic regularity as to speed and muscular movement. Rarely, and apparently only by mischance, does a ray take bait; but when hooked it affords good sport, for its impassive resistance is incomprehensibly great in comparison with its size, and comparable to the pull of a green turtle which in its wanderings has become foul-hooked. An exciting coursing match entertained me not long since, not only as an exhibition of wonderful speed and agility, but because of the wit with which the weaker creature eluded pursuit. Three hundred yards from the beach the dorsal fin of a huge hammer-head shark obtruded about two feet as it leisurely quartered a favourite hunting-ground. A sudden swirl and splash indicated that game had been sighted, and the next instant an eagle or flying ray (STOASODON NARINARI) leaped out of the sea with prodigious eagerness to reach the beach. In a series of abrupt curves the shark endeavoured to head off the ray, which, as its pursuer gained on it, shot out of the water over the shoulders of the shark, each leap being at least ten feet high. In rising it seemed to switch the shark with its thong-like tail, although apparently in almost despairing fright. After at least a dozen agile and desperate efforts, each timed to just elude the rush of the shark, both came into shallow water in which the quick and regular contours of the shark stirred the mud in a wavy pattern; it became baffled, and in a few seconds the ray slowly, and with infinite caution, "flew" (and that is the correct term to apply to a fish the movements of which in the water are analogous to the flight of a bird) into such meagre depths that the shark would have been stranded had it followed. No ripple indicated its discreet course within a few feet of the water line and it maintained its way for about two hundred yards parallel with the beach, while the shark furiously quartered the sea off shore. On the occasion of a similar hunt a ray blundered fatally because of the steeper incline of the beach. When about ten feet off the shore instead of a lateral it took a directly forward "flight," landing six feet up on the dry sand, where it fell an easy victim to a black boy, perhaps not as hungry or as ferocious as the shark, but equally partial to rays as food and incapable of any self-denying act.