Weird worm vs snake?
I live in Springfield, Mo. While walking my dog on a recent coolish summer morning the day after heavy rains the previous day I spied an unusual animal crawling on the curb. I did not have time to study it as thoroughly as I would have liked due to the pull of my dog and did not have my phone to take a picture.
I was abou 8-10" long, thin like a regular earth worm, skin that looked somewhat like it was scaled, earthworm colored with a long darker stripe down the center of its back. The oddest thing was that it had a small 'head' that fanned out like a ginko leaf and seemed to be scaling the concrete like a snail would. I would not swear to it but it seemed that the tail was blunt like a eraser end of a new pencil. I nudged it gently with my finger nail and it did not recoil, but continued to move slowly along the curb. Any idea what this creature was?
Greene County Missouri
Hard to tell from you description, but we have a couple of options.
First, after a rain, the worms that we call night crawlers do come to the surface and look for high and dry spots. They do not like soggy soils. https://en.wikipedia.org/wiki/Lumbricus_terrestris
There are a couple of small snakes that might fit your description. Find those descriptions on the MDC site.
To explore all snakes see their field guide.