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 354953; lot count 1; accn=IPA.07132; associatedwith=on same slab: IP.354954,IP.354960,IP.354961,IP.354968,IP.354974,IP.354977,IP.354955,IP.354956,IP.354957,IP.354958,IP.354959,IP.354962,IP.354963,IP.354964,IP.354965,IP.354966,IP.354967,IP.354969,IP.354970,IP.354971,IP.354972,IP.354973,IP.354975,IP.354976.
Yale Peabody Museum’s own description