Cylichna
From the collection of Yale Peabody Museum. Free to download, adapt and use — no permission needed.
Geological context: Late Cretaceous, Fox Hills Fm, Timber Lake Mbr. Collection locality: small barren conc. from between large conc. layers, dam cut at Lantry Dam, 1.5 mi WNW of Lantry, Dewey County, South Dakota, USA. Collected by Karl M. Waage, 1961. IP number 795345; lot count 1; taphonomy=concretion; accn=IPA.07048; associatedwith=on same slab: IP.795345,IP.795368,IP.795369,IP.795370,IP.795371,IP.795372,IP.795373,IP.795374,IP.795346,IP.795347,IP.795348,IP.795349,IP.795350,IP.795351,IP.795352,IP.795353,IP.795354,IP.795355,IP.795356,IP.795357,IP.795358,IP.795359,IP.795360,IP.795361,IP.795362,IP.795363,IP.795364,IP.795365,IP.795366,IP.795367.
Yale Peabody Museum’s own description