dask
dark and stormy knight
By some stroke of good luck I actually have "The Spider Of Guyana" here:You can read "The Spider of Guyana" here. (They also wrote "The Crab Spider" but I don't know if that's around.) Unfortunately, neither of those seem to be the right one. The only spider story in that volume (by title) is "The Black Spider" by Jeremias Gotthelf. That doesn't seem to have made it into public domain English but I could have missed it.
The longer the title and authors floated in my mind a vague image started to take shape. Read this book a few years ago for Halloween but don't remember too much about it other than a fuzzy recollection of a giant spider, and those two names really started to sound familiar. I may be wrong about the giant spider but I'll reread the story as soon as I can to help clear the mental mists.