interesting collection there. I agree with others- 1st 2 on the left are sea urchin spine indents, with little crimped edges that articulate with the main urchin test plates, for it to walk around. I'd go with worm for the 2nd photo. Ammos might be idable if the strata/age of the rock is known
all the best Heath
V.G photos of shark's tooth.
I agree with Dave, looks like Synechodus sp
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