Limopsis sp.
From the collection of Yale Peabody Museum. Free to download, adapt and use — no permission needed.
Geological context: Late Cretaceous, Fox Hills Fm. Collection locality: from uppermost 20 ft of massive marine sand, walls, heads & side gullies of NW-flowing tributary of Spring Creek, 1.25 mi NE of Wasserberger ranch house, & 5 mi SW of Redbird; from SW NE SE to NE NW SE sec12T37N,R63W, Niobrara County, Wyoming, USA. Collected by Karl M. Waage, Neil H. Landman, Russell D. White, Marcus Key. IP number 354931; lot count 1; accn=IPA.07132; associatedwith=on same slab: IP.354932,IP.354933,IP.354934,IP.354935,IP.354936,IP.354937,IP.354939,IP.354943,IP.354947,IP.354948,IP.354951,IP.354938,IP.354940,IP.354941,IP.354942,IP.354944,IP.354945,IP.354946,IP.354949,IP.354950,IP.354952.
Yale Peabody Museum’s own description