CP Models has some new trilobites available over on their website (note: not actual trilobites or fossils, but just pewter minis. It’d be pretty awesome, otherwise, and you’d see this in ‘Science’ and not here.).
From the update:
A new set of four Trilobite models
Ideal for monsters for sci-fi & fantasy gaming or as fossils for pulp adventure
Although aimed at 28mm they would work as larger creatures for smaller scales