The homogenous calcitic (?) area in the centre of the picture can be interpreted as a transverse section of a marginal plate of a seastar. The radiate structure beside likely resembles that of a fragmented echinoid spine.

Barnacle sections usually display lamellar structure.

Dear Prof. Ferre

What are the chances for this speciemen to be fragments of a blastoid. In Boardman, Cheetham Fossil Invertebrates, page 582, Figure 18.37, Hydrospire in a blastoid is depicted, which shows some resemblance to upper part of this speciemen, I would be thankful to have your response.

Dear Hesameddin,

By chances, you mean among some 500,000 or so bioclastic sections?

For more recent references, please check Erik Flügel's final book ob carbonate Microfacies (Springer).

good luck, best