Of course Darwin never said "hundreds of millions" that is a ludicrous claim.
But here is a fact: in the past 150 years, when many, many thousands of fossils have been found, studied and preserved for science not one has ever been found to disprove evolution theory.
As for "transitional forms", the fact is that every fossil, without exception, is a "transitional form" between its ancestors and its descendants (if any).
So the evolutionary "tree of life" is chock-full of "transitional forms".
However, of all the millions of species which ever lived, the numbers of fossil species found so far is no more than 1%.
So, there are many links yet to be found.
Still a Horse.
“However, of all the millions of species which ever lived, the numbers of fossil species found so far is no more than 1%. “
Then how do you know there are millions more not found if you haven’t found them?
I guess I am a billionaire, I just haven’t found the billions.