f all the boys. A
trip to the wreckage disclosed the fact that Frank had made his bed on
the hard, smooth sand with a fire in front of him for protection from
the chill winds of the night.

"Here's the fire stick," exultantly cried Arnold. "Gee, won't I have a
great story written about this adventure when I get back to little old
Chi. Sherman Street won't know me when I arrive."

"Hurray," cried Harry who had wandered a short distance from the others.
"Hurray, I've found the horse that belongs to the horseshoe! Here he is
buried upside down in the sand."

Hastening to the spot indicated the boys saw what looked to be a horse's
foot upside down in the sand. So startling was the resemblance that Jack
and Arnold were completely deceived for a moment, but Frank's laugh soon
indicated that they had been mistaken.

"What is it?" asked Arnold eagerly. "Gee, but I see so many new things
here I don't know which to write a story about first."

"Better not write any story about this," admonished Frank. "The
wonderful phenomenon you see before you, my friend, is not a horse at
all. It is merely a crab shell from which the crab has gone."

"A crab shell?" repeated Arnold in wonderment. "A real crab?"

"Sure enough," declared Frank. "The underside of the shell has exactly
the same outlines as the under side of a horse's foot. This fellow has
projecting from the heel a spikey tail that is hard and sharp at the
end. The whole thing, as you see, is dried and hardened by exposure to
the weather. The crab has been gone a long time."

"I'm going to take it along," asserted Arnold. "I'll put it in my locker
and make a collection of things I pick up. I'd like to see a flounder
now so as to recognize one the next time I see it."

"I have a fine big fellow at the place I had my fires," Frank answered.
"We'll go over there and see how he's getting on. I got him last night.
I think he must weigh as much as three or four pounds."

"Tell me some more about this Spanish Treasure Chest," Jack said as the
boys turned toward the site of Frank's camp. "I'm anxious to know
everything you overheard anywhere that would have a bearing on the
matter from any viewpoint. It's interesting."

"I can't tell you any more than I have. I know these fellows objected to
our visiting this locality because they seemed to believe that we were
trying to get something that belonged to them and they were ready to
employ force if necessary to keep us out," Frank