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Here's a specimen I acquired a while back. The worm is quite small (21mm long, ~1mm wide) and hard to photograph but I did my best. The question is, what are those little oval pellet-like things inside (or on) the worm? Its last meal? Parasite? Something taphonomic in nature (I doubt it)? Any ideas would be appreciated! Not sure of the worm's ID, either. I guess either Maotianshania or Cricocosmia (or Paleoscolex?) They're all so similar I'm not sure how to tell them apart. There should be enough detail - looks like everything including the spiny head/proboscis (left end) is visible.

I purchased this beautiful pile of poo pellets, and the matrix contained this little hitchhiker. Since I know next to nothing about trilobites, I was hoping for an assist. He dates from the Middle Ordivician (Llandeilian), and was found in the Traveusot Group (Angers), in La Meignanne, Maine-et-Loire, France. I don't know if the second photo is more of Jaques or just another trilo-bit. Thanks for indulging me. Yeah, I'm digressing.....

I found this a couple of years ago and have periodically taken it out to examine it as I've found the accumulation of fauna adhering to it's surface as very interesting. For awhile I affectionately referred to it as an accretion (as opposed to a concretion), envisioning a clump of mud rolling around in the wave action of a shoreline picking up bits of dead fauna. But now, with the fairly recent posts that have come up about crustacean burrows, I'm second guessing. On the exterior of this piece are brachiopod shell bits and molds, possible pectinid shell molds, crinoid columnals, and tiny gastropod steinkerns and exterior molds with decoration. The dark clumps appear to be pyrite. There are two depression areas, one on the large end, and a smaller one that is offset of the smaller end. These I speculate to be the exposed chamber, should this be a burrow. Notably within these depressions are oval shaped pellets and an interesting fibrous texture. So, I now defer to your opinions! Thank you for looking!