There were crabs here, too, many of them, and they were performing the queerest antics imaginable. Some were building themselves into a pyramid, each standing on edge, with the biggest and strongest ones at the bottom. When the crabs were five or six rows high, they would all tumble over, still clinging to one another and, having reached the ground, they would separate and commence to build the pyramid over again. Others were chasing one another around in a circle, always moving backward or sidewise, and trying to play "leapfrog" as they went. Still others were swinging on slight branches of seaweed or turning cartwheels or indulging in similar antics.
Merla and the earth people watched the busy little creatures for some time before they were themselves observed, but finally Trot gave a laugh when one crab fell on its back and began frantically waving its legs to get right-side-up again. At the sound of her laughter they all stopped their play and came toward the visitors in a flock, looking up at them with their bright eyes in a most comical way.
"Welcome home!" cried one as he turned a back somersault and knocked another crab over.
"What's the difference between a mermaid and a tadpole?" asked another in a loud voice, and without a pause continued, "Why, one drops its tail and the other holds onto it. Ha, ha! Ho, ho! Hee, hee!"
"These," said Merla, "are the clown crabs. They are very silly things, as you may already have discovered, but for a short time they are rather amusing. One tires of them very soon."
"They're funny," said Trot, laughing again. "It's almost as good as a circus. I don't think they would make me tired, but then I'm not a mermaid."
The clown crabs had now formed a row in front of them. "Mr. Johnsing," asked one, "why is a mermaid like an automobile?"
"I don't know, Tommy Blimken," answered a big crab in the middle of the row. "WHY do you think a mermaid is like an automobile?"
"Because they both get tired," said Tommy Blimken. Then all the crabs laughed, and Tommy seemed to laugh louder than the rest.
"How do the crabs in the sea know anything 'bout automobiles?" asked Trot.