"Though perhaps we may meet with a sea-cow," suggested Betty, as she looked for a pleasant place whereon to go ashore for lunch.
"What's a sea-cow?" asked Mollie.
"One that eats sea-weed," cried Amy.
"No, I mean a manatee," went on Betty. "Don't you remember the big creatures we saw in the New York aquarium a year or so ago?"
"Oh, yes!" exclaimed Amy. "Well, they're not as bad as alligators—at least they haven't such large mouths."
"And they only eat—grass," added Mollie.
Betty was sending her boat ahead at good speed, scanning the shores of the river for some quiet cove into which to steer. The day was warm, and the sun shone down unclouded. From the banks came the odor of flowers.
Suddenly, as the boat chugged along, there came a momentary halt, as though it had struck something.
"What's that?" cried Grace.
"Maybe an alligator has us," suggested Mollie with a laugh. For the Gem went on as though nothing had happened.
"Don't be silly!" chided Grace. "It was certainly something."
Betty looked back a bit nervously, and glanced at the engine.
