After examining it carefully for a moment Joseph exclaimed: “You must have found its mouth. This is surely a baby crab which has been swallowed. See its little legs drawn up to its body.” Both agreed that they had found a crab. They again turned their attention to the oyster’s mouth. “What a large mouth for such a little animal! See how far I can put the point of my knife into it. It must have some bowels. I wonder if its bowels are here at the larger end. It looks puffy and dark inside. The thing is so slippery that I can scarcely handle it.” “Can it see, Willis?” “I can find no eyes.” The boys took the oyster out of the water several times that they might see how it looked tucked so snugly between its shells. Every time they touched it the opening was closed tight. Thus the boys spent the afternoon. When Joseph went home Willis said: “Come over to-morrow and we will get auntie to tell us more about the oyster.” After dinner Willis went to his room and watched his oyster again until his eyes drooped. Presently there was a thump-thump-thumping across the floor behind him. What was Willis’s surprise to see a big library book come near and with one leap place himself on the table. He was again surprised to see the oyster reach a long arm out of the water and the book another long arm from between its leaves. They two then shook hands. Both raised themselves to a vertical position and made a bow to Willis. “We will try to tell you what you wish to know. Then you can surprise Aunt Jennie by telling her some things.” As he spoke Mrs. Oyster swelled herself up so large that the soft white matter protruded from the shell; for she had never before had the high honor of talking to a real boy. Willis was so pleased that he clapped his hands. Mrs. Oyster crawled up and nicely balanced herself on the edge of the dish. Willis was speechless with surprise. Book spoke: “This is Mrs. Oyster. She belongs to the subkingdom of shellfish called Mollusca. All of her folks have soft bodies. As she is protected by a shell of two parts, she is said to be a bi-valve. Her relative, Snail,” said he, motioning with his hand, “having a single shell is called a uni-valve.” Looking in the direction of the movement of Book’s hand, what was his surprise to see a snail with a shell on his back crawling across the table. Where he came from, Willis could not tell. “When looking at that oyster this afternoon you noticed a thickened portion fastened to a dark spot on the valve,” said Book. “I remember,” said Willis.