help identifying spiral fossils from ireland

[Brian James Maguire]

hi guys, bit confused as to what these are, i found them on the beach yesterday, and preped them out today, any ideas ? 

[Ludwigia]

Nice! Naturally polished goniatites.

[Brian James Maguire]

3 hours ago, Ludwigia said:

Nice! Naturally polished goniatites.

Thank you for the reply, i had an idea they were Goniatite but just wasn’t 100%

[TqB]

I think they might be a better fit for a loosely coiled nautiloid. The simple chamber walls, narrow conch with slow taper and apparent lack of centre whorls suggest something like Vestinautilus or Aphelaeceras. There's also possibly a central siphuncle suggested in a few places. It's hard to be sure from irregular sections though.

Edited September 3 by TqB

[Ludwigia]

Just for comparison. Here are some cut and polished goniatites from Bad Grund, Lower Saxony.

 

[Brian James Maguire]

2 hours ago, TqB said:

I think they might be a better fit for a loosely coiled nautiloid. The simple chamber walls, narrow conch with slow taper and apparent lack of centre whorls suggest something like Vestinautilus or Aphelaeceras. There's also possibly a central siphuncle suggested in a few places. It's hard to be sure from irregular sections though.

Having looked at pics of both suggestions i would have to agree they would be a better fit, thank you for the detailed reply, its fun to get to the bottom of these fossil mysteries