It has plenty of distinct, well-defined species--trilobites, and ammonites, and echinoderms, palms, ferns, firs, and mosses, all sorts of quadrupeds from a mouse to a mastodon, and all just as clean-cut and well-defined as the species of existing animals.
Mr.Darwin can not find his connecting links between the species, which ought to have been a hundred times more plentiful than the species they connected.

These connecting links are missing links.

He ought to be able to overwhelm his opponents, and bury them under mountains of the bones of intermediate species.

But all his friends can do is to suggest about half a dozen, while he needs three hundred thousand.

He can not pay half a cent on the dollar.