I.     LOST ON AN OCEAN FLOOR II.    A CONFLICT OF AUTHORITY III.   "THE DANDY SUBMARINE" IV.    A WOLF ON THE TRAIL V.     TWO WOLVES IN A PEN VI.    NIGHT ON AN OCEAN FLOOR VII.   THE SECRET OF THE HOLD VIII.  ON GUARD UNDER THE SEA IX.    "JIMMIE'S FOOLISH--LIKE A FOX" X.     A CHASE ON THE OCEAN FLOOR XI.    JIMMIE GOES OUT HUNTING XII.   JACK MAKES A DISCOVERY XIII.  JIMMIE DEMANDS A MEDAL XIV.   A BOY SCOUT WITH A "PUNCH" XV.    A DESPERATE PRISONER XVI.   A BLUFF THAT DIDN'T WORK XVII.  BAD FOR THE SEA CREATURES XVIII. "MAKING A GOOD JOB OF IT" XIX.   ON THE EDGE OF DISASTER XX.    AN ENDING AND A BEGINNING