Hello,
I bought that specimen labeled Coprinoscolex ellogimus.
I'm not really convinced that this ID is correct. Maybe it is compressed and distorted and thus not as worm-like as usually. I show pictures of both sides (counterpart).
There is a second question. There are small wormlike structures on the surface of the specimen. However, they don't look like tubeworms. Maybe they are some kind of coprolite, or the sandy content of the intestine of the animal that left the intestine at several places due to injuries. If so, there must have been multiple injuries which may indicate that the animal became the victim of a predator?
araucaria1959