Hymeniacidon perlevis by ChrisMcA at 1:05 pm 01/08/12

Confidence: I'm as sure as I can be.

Notes: there's no sign of panicea's volcano-like excurrent holes (Osculi)(indeed the osculi are invisible; the colour's within perlevis's range (orange to red), & the contorted surface fits, & it's an abundant species & likes muddy conditions & this locn has plenty of mud nearby