Calliostoma mitchelli from the upper Pliocene Yorktown Formation of Isle of Wight County, Virginia (SDSM 135255).Calliostoma mitchelli from the upper Pliocene Yorktown Formation of Suffolk County, Virginia (SDSM 139687).Calliostoma mitchelli from Gardner (1948), pl. 26, figs. 19, 23. Holotype, ANSP. James River, Virginia.