I never dreamed of considering that any one group, under all conditions and throughout the world, would be predominant.

How could vertebrata be predominant under the conditions of life in which parasitic worms live?
What good would their perfected senses and their intellect serve under such conditions?
When I have spoken of dominant forms, it has been in relation to the multiplication of new specific forms, and the dominance of any one species has been relative generally to other members of the same group, or at least to beings exposed to similar conditions and coming into competition.

But I daresay that I have not in the "Origin" made myself clear, and space has rendered it impossible.

But I thank you most sincerely for your valuable remarks, though I do not agree with them.
About sudden jumps: I have no objection to them--they would aid me in some cases.

All I can say is, that I went into the subject, and found no evidence to make me believe in jumps; and a good deal pointing in the other direction.