Neotypes are designated herein for certain Paleocene species of juglandaceous pollen that were originally described in 1978. The microscope slides bearing the holotypes have been lost, eliminating the possibility of designating lectotypes and necessitating, instead, the designation of neotype specimens to stabilize the nomenclature of the species, which are biostratigraphically significant. The species for which neotypes are designated are Momipites wyomingensis, Momipites waltmanensis, Momipites ventifluminis, Momipites actinus, Momipites anellus, Momipites leffingwellii, Caryapollenites prodromus, Caryapollenites imparalis, Caryapollenites inelegans, and Caryapollenites wodehousei.