I don't think so. If you google 'ricinus fruit picture' it comes up with a prickly looking thing. No, definitely ivy fruits.

Allow them to dry out and plant then,they should really be left on the plant to dry naturally. You should also wear gloves as these seeds are toxic. Research this plant thoroughly ,should not be grown at all if children around Steve.

I agree with Volunteer doesn't look like a Caster Oil plant fruit... much more like immature ivy fruit.

fatshedra flower/seedhead perhaps.

I was going on the information that Steve said he had cut it from a castor oil plant.

Oh, I see - you've posted this twice, one with a picture and one not! This is the flower from Fatsia japonica (not, in fact, Castor Oil plant, but does look a bit like one). Lovely architectural shrub, gets pretty big, but can be pruned (best done around May)