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n find out about Niobe's oceans, there is virtually no acceptable food for starfish other than oysters and some microscopic animal life that wouldn't sustain an adult." "Okay, I believe you. But you still leave me cold. I can't remember anything about a starfish that would help him break an oyster shell." Bergdorf grinned. "I see you need a course in marine biology. Here's a thumbnail sketch. First, let's take the oyster. He has a big muscle called an adductor that closes his shell. For a while he can exert a terrific pull, but a steady tension of about nine hundred grams tires him out after an hour or so. Then the muscle relaxes and the shell gapes open. Now the starfish can exert about thirteen hundred grams of tension with his sucker-like tube feet, and since he has so many of them he doesn't have to use them all at one time. So, by shifting feet as they get tired, he can exert this pull indefinitely. "The starfish climbs up on the oyster shell, attaches a few dozen tube feet to the outside of each valve and starts to pull. After a while the oyster gets tired, the shell opens up, and the starfish pushes its stomach out through its mouth opening, wraps the stomach around the soft parts of the oyster and digests it right in the shell!" I shuddered. "Gruesome, isn't it?" Bergdorf asked happily. "But it's nothing to worry about. Starfish have been eating oysters on the half shell for millions of years. In fact I'll bet that a starfish eats more oysters in its lifetime than does the most confirmed oyster-addict." "It's not the fact that they eat them," I said feebly. "It's the way they do it. It makes me ill!" "Why should it? After all a starfish and a human being have a lot in common. Like them, you have eaten oysters on the half shell, and they're usually alive when you gulp them down. I can't see where our digestive juices are any easier on the oyster than those of a starfish." "Remind me never to eat another raw oyster," I said. "On second thought you won't have to. You've ruined my appetite for them forever." Bergdorf chuckled. "Well, now that you've disposed of one of my eating habits," I said bitterly, "let's get back to the problem. I presume that you'll have to find where the oysters are before you start in working them over with starfish." "You've hit the reason why I'm here. That's the big problem. I want to find their source." "Don't you know?" "I can make a pretty good guess. You
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