A Google search for “dried up slug” reveals at least one similar item.
See this is why I have a microscope at work.
In a few weeks the poster and possibly the entire family will be replaced by replicas. Check your basement now.
John Bobbitt’s Penis?
Do you have a toddler? It looks to me like a horribly spoiled section of orange or other citrus fruit. That edge along the top left looks a lot like a section of orange would have once connected to the other sections, though it have had been white when fresh.
No toddlers. Just me, the spouse, the cats, and the gecko.
I guess it’ll have to remain forever a mystery. Out of all the likely explanations, the slug seems the most plausible, though. It definitely had an organic feel to it, and no way was it a dried-up something.
Yeah, I save my roaches and it looks like a roach with the paper removed.
That’s the last thing I would do,have you ever watched Alien?
Anyway,fwiw I reckon it’s a small fish.
If it is, it got tracked in from outside.
Either that, or we need to have a serious conversation with the cats.
WDVE’s one DJ had a cat named Ralph who would sometimes call the show
Just sayin – secret life of pets and all that. 
Okay, you guys made me more curious, so I dug it out of the trash and put it in some water to try re-hydrating it, then cut it open. I am certain it’s not some kind of poop now, because it didn’t fall apart when I poked at it with tweezers. It had a layer of some kind of slimy stuff on the exterior, which I could peel bits of off. Wet, it had a definite “organic” smell to it…kind of like what you get when snip a flower stem and sniff it (the green part, not the flower).
Nothing definitive inside like guts, but slugs don’t have guts per se, do they? I’m still going with “some kind of small slug.”
I threw it away again (this time without the paper towel wrapping) so no more experiments. Thanks for all the suggestions!