Drepanochilus sp.
From the collection of Yale Peabody Museum. Free to download, adapt and use — no permission needed.
Geological context: Late Cretaceous, Fox Hills Fm, Trail City Mbr. Collection locality: conc. 1, in face on SW side of slump block 300 ft SSW of loc. C0066, Whitehorse ridge, and 6 mi NW of Whitehorse, Dewey County, South Dakota, USA. Collected by Ian G. Speden, 1962. IP number 854915; lot count 1; accn=IPA.07048; associatedwith=on same slab: IP.854915,IP.854929,IP.854927,IP.854926,IP.854925,IP.854921,IP.854923,IP.854931,IP.854922,IP.854948,IP.854947,IP.854946,IP.854945,IP.854944,IP.854930,IP.854943,IP.854941,IP.854940,IP.854939,IP.854938,IP.854937,IP.854936,IP.854935,IP.854934,IP.854933,IP.854932,IP.854920,IP.854919,IP.854917,IP.854918,IP.854949,IP.854950,IP.854951,IP.854952,IP.854953,IP.854954,IP.854955,IP.854957,IP.854958,IP.854959,IP.854960,IP.854961,IP.854962,IP.854963,IP.854964,IP.854965,IP.854966,IP.854967,IP.854968,IP.854969,IP.854916,IP.854928,IP.854942,IP.854956.
Yale Peabody Museum’s own description