“I told you so,” cried Pat exultingly; “we shall have as many as we like to catch.”

All were now eager to get their lines overboard, and no sooner had the hooks sunk towards the bottom than the fish, attracted by the tempting bait, dashed forward and seized them.

“We’ll mighty soon have a boat load,” exclaimed Pat, as fish after fish was hauled in.

Suddenly a change came over the scene. From out of a cavern, far down below the reef, a huge form appeared, very similar to the monster which had attacked the boat in the stalactite cave. Rapidly and noiselessly it glided up, and before Billy, who just then felt a bite, saw its approach, it had seized the fish which had bitten at his hook. Billy gave a pull, expecting to haul up his fish, and very nearly got his fingers cut through by his line, as the shark, finding something tickling his throat, darted off with it. Bird, seeing what had happened, cut the line, and away dashed the shark. The monster had put the other fish to flight, and it was some time before they returned. Scarcely had they assembled, and a few more had been caught, than, other sharks appearing, the lines were immediately drawn up, to save them from the fate Billy’s had met with. As these pirates of the deep appeared, the smaller fish darted off in all directions.

“Shure, it matters very little to them whether they are caught by one of us or by those black brutes, excepting for the honour of the thing, and the pleasure of tasting a crab’s leg before they die,” observed Desmond.

These interruptions prevented the party taking note of time. They had got no small number of fish, still they were eager to catch a boat load; and Tom, who ought to have looked at his watch, forgot to do so.

Thus hour after hour passed by, until they all began to get hungry, when Desmond proposed going on shore and cooking some of their fish. The idea was too good a one to meet with dissenting voices; and returning to the beach, they quickly made up their fire, the embers of which had remained burning, and soon had three or four fine fish roasting on sticks round it, under the superintendence of Pat Casey. So busy were they with this interesting occupation, that no one had observed the changed appearance of the sky. The fish were, as Pat declared, “just done to a turn,” and Tom and Desmond and Billy were served, the latter having filled his mouth with a dainty morsel, when they were startled by the booming sound of a gun. Another followed. It was evidently fired for their recall.

“We ought to have got back before this,” exclaimed Tom, starting up and looking seawards.

The rest followed him, carrying the cooked fish down to the beach. What was their dismay to find, on reaching it, that the boat, which had been hauled up, had been floated by the rapidly rising tide, while a strong gust of wind had driven her a considerable distance from the shore, from which she was drifting further and further off.

Not a moment was to be lost. Tom felt that he had been guilty of an act of indiscretion in remaining so long on shore, and in not having seen that the boat was properly secured. He had not forgotten those huge monsters of sharks, which had been prowling about, but there was only one way by which the boat could be regained. Somebody must swim off to her. These thoughts rapidly passed through his mind. The swim itself was nothing; he had often swum ten times further without fatigue. But those sharks! He recollected the shudder which had passed through him as he had seen them approach the boat not two hours before. Without saying anything, he had quickly thrown off his clothes.