Danchekker's voice faded away for a few seconds. "If I were a Lunarian," he said suddenly, his voice decisive, "I would explain what I saw thus: Life began in the distant past on Minerva, evolved through the accepted process of mutation and selection, and branched into many diverse forms. About twenty-five million years ago, a particularly violent series of mutations occurred in a short time, out of which emerged a new family of forms, radically different in structure from anything before. This family branched to produce its own divergency of species, living alongside the older models, and culminating in the emergence of the Lunarians themselves. Yes, I would explain the new appearances in that way. It's similar to the appearance of insects on Earth—a whole family in itself, structurally dissimilar to anything else." He thought it over again for a second and then nodded firmly. "Certainly, compared to an explanation of that nature, suggestions of forced interplanetary migrations would appear very farfetched indeed."

"I was hoping you'd say something like that." Hunt nodded, satisfied. "In fact, that's very much what they appear to have believed. It's not specifically stated in anything I've read, but odds and ends from different places add up to that. But there's something odd about it as well."

"Oh?"

"There's a funny word that crops up in a number of places that doesn't have a direct English equivalent; it means something between 'manlike' and 'man-related.' They used it to describe many animal types."

"Probably the animals descended from the imported types and related to themselves," Danchekker suggested.

"Yes, exactly. But they also used the same word in a totally different context—to mean 'ashore,' 'on land' . . . anything to do with dry land. Now, why should a word become synonymous with two such different meanings?"

Danchekker stopped eating again and furrowed his brow.

"I really can't imagine. Is it important?"

"Neither could I, and I think it is. I've done a lot of crosschecking with Linguistics on this, and it all adds up to a very peculiar thing: 'Manlike' and 'dry-land' became synonymous on Minerva because they did in fact mean the same thing. All the land animals on Minerva were new models. We coined the word terrestoid to describe them in English."

"All of them? You mean that by Charlie's time there were none of the original Minervan species left at all?" Danchekker sounded amazed.

"That's what we think—not on land, anyway. There was a full fossil record of plenty of types all the way up to, and including the Ganymeans, but nothing after that—just terrestoids."

"And in the sea?"

"That was different. The old Minervan types continued right through—hence your fish."

Danchekker gazed at Hunt with an expression that almost betrayed open disbelief.

"How extraordinary!" he exclaimed.