Clypeus plotti (Salter)
Matrix free beautifully preserved test. If you take a line down the centre of the Echinoid you can see that one side has grown more than the other. Some form of genetic pathology so that the overall shape is not in pentameral symmetry like it should be. First example like this I have ever seen.
Jurassic, Bajocian, Clypeus Grit.
Wyke Rissington, Gloucestershire.
Echinoid : 8 x 7.5 cm.