Fossil echinoid?

[Pleuromya]

I found this interesting fossil the other day, and have struggled to find out what it is. It's from the Jurassic of Northamptonshire. Scale is centimetres. It's partially broken, so may have been completely spherical?

Many thanks. Sorry the pictures are a little dark.

[Darbi]

Better pictures would be needed. I suggest you to take pictures outside in the daylight, the light is much crisper.

[Pleuromya]

18 hours ago, Darbi said:

Better pictures would be needed. I suggest you to take pictures outside in the daylight, the light is much crisper.

Yes that'd probably be best. I'll do it as soon as possible. 

[Pleuromya]

It's been cloudy and rainy most of the week, sorry I haven't uploaded an image yet. This might be a little better.

[Darbi]

On 7/2/2020 at 2:47 PM, Chris Jones said:

It's been cloudy and rainy most of the week, sorry I haven't uploaded an image yet. This might be a little better.

That's better, but it's still hard to tell from this picture. That would be great if you can get it to focus better. I still have no idea what it is. 

[Pleuromya]

On 06/07/2020 at 4:38 PM, Darbi said:

That's better, but it's still hard to tell from this picture. That would be great if you can get it to focus better. I still have no idea what it is. 

Here are a few more, sorry about the quality, it might just be a bit better than the previous ones. There's a small depression on the top, and the bottom is covered with rock. 

[Darbi]

I'm getting a bivalve vibe but other than that, I have no idea. Sorry. I hope someone else on here will have an idea.

[Pleuromya]

34 minutes ago, Darbi said:

I'm getting a bivalve vibe but other than that, I have no idea. Sorry. I hope someone else on here will have an idea.

Thanks, I'll keep it safe, perhaps I might see something similar some day. 

[Darbi]

2 hours ago, Chris Jones said:

Thanks, I'll keep it safe, perhaps I might see something similar some day. 

Hopefully!