Mepygurus depressus Agassiz in Agassiz & Desor 1847.
Matrix free test. Nice preservation. The upper surface has two species of marine worm attached. On the same surface thee are numerous slit like holes in the test. These are probably the result of predation by sponges. Nice example.
Jurassic, Upper Bathonian.
Les Vaux, Paugny, France.
Echinoid : 5.5 x 5.5 x 1.5 cm.