Brasilia ?flocossa (Buckman, 1899)

11cm. Found at the clay pit in Geisingen. Geisingen-Oolith, Concavum Zone, Upper Aalenian, Middle Jurassic. Not absolutely certain about the species ID. Even the experts are stumped with it to date, but I like the looks of it with the well-preserved keel, so I thought I'd post it anyway.