Here's some perspective on Lamarck in textbooks. This essay is a decade old, but still being referenced.
http://www.textbookleague.org/54marck.htm
Good reason for any publisher to drop the Lamarck story ~ it's simply hearsay.
Oh, yeah, another reason to drop Lamarckianism from biology books ~ both the original, and the made-up versions ~ it's "history" and not "biology", and its use for any purpose in a biology text belies the idea that "evolution is fundamental to biology".