Mesozoic and Ocenozoic Oeology and Pal(B07itology. 241 



pumilus, Helohyus plicodon, Thinotherium validuyn, Passalacodon 

 litoralis, Anisacodon elegans, Centetodon pulcher, Stenacodon rams, 

 Antiacodon venustus, Baihrodon annectens, B. typus, Mesacodon 

 speciosus, Hemiacodon gracilis, H. nanus, H. pucillus, Centetodon 

 altidens, Entomodon comptus, Entomacodon minutus, Centracodon 

 delicatus, Nyctilestes serotinus, Ziphacodon rugatus, Harpalodon 

 sylvestris, H. vulpinus, Orotherium ■ uintanum, Helaletes hoops, 

 Paramys robustus, Tillomys senex, T. parvus^ T. lucaris, Sciuravus 

 parvidens, Colonymys celer, Apatemys hellus, A. bellulus, Entomaco- 

 don angnstidens, Triacodon grandis, T. nanus, Earyacodon lepidus, 

 Paloeacodon vagus, Aletornis nohilis^ A.pernix, A.venustus, A. bellus, 

 A. gracilis, Uintornis lucaris, Thinosaurus agilis, T. crassus, T. 

 grandis, T. leptodus, T. paucidens, Olyptosaurus princeps, Oreosaurus 

 vagans, Tinosaurus stenodon, Glyptosaurus brevidens, G. rugosus, G. 

 sphenodon, Oreosaurus lentus, 0. gracilis, 0. microdus, 0. minutus, 

 Tinosaurtcs lepidus, Iguanavus exilis, Tinoceras grandis, Dinoceras 

 lacustris, and Oreocyon latidens. He described, from the Post- 

 pliocene, near Bangor, Maine, Catarractes afinis, and from Monmouth 

 county, New Jersey, lleleagris celer, and Grus proavus. Of the above 

 list, it is stated by Cope that the new generic names are not generally 

 defined. 



Dr. Joseph Leidy* described, from the Bridger Group of W3'oming, 

 Uintacyon edax, U. vorax, Chameleo pristinus^ Lepidosteus atrox, L. 

 notabilis, L. simplex, Amia gracilis, A. media, A. uintensis, Hypamia 

 elegans, Pimelodus antiquus, Phareodus acutus, Hyrachyus nanus, 

 3Iicrosyops gracilis, Palmacodon verus, Hipposyus formosus, Paloio- 

 syops junior^ P. humilis, and Uintatherium robustum. From 

 the Niobrara Group, on the Niobrara river, in Nebraska, Felis 

 angustus ; from Green river, OUgosomus grandoevus ; from the 

 Black Foot country at the head of the Missouri, TylosteuD ornatus; 

 and from the Pliocene of Oregon, Hadroliyus supremus. Rhinoceros 

 pacijicus, and Stylemys oregonensis. 



Prof. F. B. Meek f described, from the Green River Group at 

 Washakie, W\'oming, Unio washakiensis, and from Pacific Springs, 

 Bythinella gregaria. 



T. A. Conrad;]; described, from the Eocene of North Carolina, Ostre- 

 nomia carolinensis ; and from the Miocene of the same state, Donax 

 idoneus. 



* Proc. Acad. Nat. Sci. 

 i Geo. Sur. of Wyoming. 

 X Proc. Acad. Nat. Sci. 



