While thus engaged in watching the bursting of the waves upon the reef, I suddenly heard Johnny at a little distance calling out lustily for help, and hastening to the spot, I found him in one of the yawning crevices of the coral rock, up to his neck in water, and struggling violently to get out, in which he seemed to meet with opposition from some object in the hole. "Something has got me by the feet," he cried, as soon as he saw me; "it is an enormous oyster, or a shell-fish of some kind, and it pinches dreadfully." I looked down into the water, and saw what in fact, seemed to be a gigantic shell-fish, gripping both his legs: it retained its hold so tenaciously, that I found I could not extricate him, and when Arthur came up, as he did in a moment, it was as much as we could both do, to lift him and his singular captor, which still clung obstinately to him, out of the crevice. We were then obliged to pry open the shells with our cutlasses before we could release him. Arthur pronounced this extraordinary shell-fish, to be a specimen of the "Chama Gigas." The shells were nearly three feet in length, and curiously marked and clouded. Johnny had slipped from the slimy edge of the chasm, and happened to fall fairly into the expanded jaws of the chama, which, had instantly closed upon him. If the water had been deeper, the consequences might have been serious, as there are instances of persons being drowned, by having their feet caught in the vice-like grip of this formidable bivalve.