Between the years 1940 and 1968 Schultz and Falkenbach published eight papers revising the taxonomy of oreodonts (Merycoidodontidae). Although these papers suffer from many difficulties, including the oversplitting of taxa and the citation of plastically deformed features as diagnostic characters (M. S. Stevens, personal commun.), they remain the primary systematic work on oreodonts produced this century.

A new species of Megacerops, M. kuwagatarhinus, is described from deposits belonging to the White River Group in southeastern Montana. Megacerops kuwagatarhinus is distinguished from all other species of Megacerops by the peculiar morphology of the horns, which are bifurcated distally into two well-developed branches. Two specimens from the Hunter Quarry of Saskatchewan, Canada, also share this horn morphology and are referred to the species.

In 1904 Osborn named a new species of Mesohippus, M. validus, based on a specimen consisting of a skull, jaws, and portions of the limbs. Osborn identified this specimen as American Museum of Natural History (AMNH) catalog number 680 and provided a brief description, some measurements, and an illustration.

The newly organized Long Island Natural History Museum (LINHM) has assembled a small collection of fossil vertebrates from the Cretaceous of Morocco. Among the remains in this collection are two spinosaurid (Theropoda) teeth and one sauropod tooth that we refer to either the Diplodocidae or Titanosauridae. Because of the scarcity of spinosaurid and Cretaceous sauropod teeth, a short description of the material is presented here. In addition to the dinosaurian remains, the collection includes an unidentified crocodilian tooth and a tooth identified tentatively as that of a pterosaur, which we also describe briefly. Furthermore, there are other fossil reptile teeth from the Ksar es Souk Province in the collections of the LINHM. Some of these may represent groups of reptiles other than those discussed here, but the taxonomic identity of these teeth is still being determined.