510 



CENOZOIC TIME. 



(1.) Fishes, in the inferior shales, in the Green River group. The Gars, Lepidosteus 

 glaber Mh., L. Wh tneyi Mh., Amia Ntwberrianus Ml)., A. depressus Mb. ; the Teliosts, 

 Clupea humilis L., Cltipea pusilla Cope, Hellubatls radians Mh., a land-locked ray. 



(2.) Reptiles. — Species of Emys, Trionyx, etc., among Testudinates; of Alligator, 

 Crocodilus, Diploeynodus, Limnosaurus, etc., among Crocodilians ; of Saniva (of Leidy), 

 Naocephalus (of Cope), Thinosaurus leptodus Mh. (seven feet long), Glyptosaurus prin- 

 ceps Mh. (six feet long), among Lacertilians; Boavus occidentalis Mh., probably eight or 

 ten feet long, B. agilis Mh., B. brevis Mh., Lithophis Sargenti Mh. 



(3.) Birds. — An Owl, Bubo leptosteus Mh.; the Woodpecker (?), Uintomis lucaris 

 Mh. ; the Waders, Aletornis nobilis Mb., A. gracilis Mh., etc. 



The following are some of the described species from the Wahsatch group. Ungu- 

 lates : Coryphodon hamatus Mh., C. elephantopus ; Helaletes (Eyrachyus Cope) singu- 

 laris, JEohippus tapirinus Mh., E. validus Mh., E. pernix Mh., Parahyus vagans Mh. 

 Carnivores: Oxyaina lupina Cope. Tillodonts: Dryptodon crassusMb.., Cakunodon sim- 

 plex Cope. From the Bkidger group. Ungulates: Palceosyops paludosus L., P. major 

 L., P. levidens Cope, Telmatotherium validus Mh., Limnohyus robustus Mb., Hyrachyus 

 agrarius L., H. Bairdianus Mh.. Helaletes boops Mh., Orohippus agilis Mb., IJelohyus 

 lentus Mh., Homacodon vagans Mh., Amynodon advenus Mh. (from the Uinta beds), 

 Uintatherium robustum L., U. Leidy anum Osborn, Scott and Speir, Dinoceras mirabile 

 Mh., Tinoceras anceps Mh., Tinoceras grandis Mh. (Loxolophodon comutus Cope, ac- 

 cording to Marsh). Tillodonts: Tillotherium hyrocoides Mh., Anchippodus minor Mh., 

 Stylinodon minis Mb., Trogosus castoridens L. Primates allied to the Lemurs: Lemur- 

 avus distans Mh., H y op sodus p aulas L., H. gracilis Mh., Limnotherium tyrannus Mh., 

 L. elegansMh., Thinolestes anceps Mh., Telmatolestes crassus Mh. Carnivores: Mesonyx 

 obtuside.ns Cope (size of Wolf). Limnofelisferox Mh. (size of Lion), Limnocyon ripnrias 

 Mb., Oreocyon latidensMh., D romocyon vorax Mh., Vulpavus palustris Mh., Viverravus 

 gracilis Mh., Ziphacodon rugatusMh. Rodents: Paramys delicatus I.., P. leptodus Cope, 

 P. robustus Mh., Sciuravus parvidens Mb., Tillomys senex Mh., Colonomys cehr Mh. 

 Insectivores : Palceacodon verus L., Passalacodon Utoralis Mh., Talpavus nitidus Mh., 

 Cenletodon pulcher Mh. Bats: Nyctitherium velox Mh., iV. priscum Mh., Nyciilestes 

 serotinus Mh. Marsupials, Triacodon fallax Mh., 7\ grandis Mh., 7 1 . aculeatus Cope. 



S. Yorktown Period, 



Miocene. 



1. Mollusks. —In the marine beds of the Atlantic Border. —Fig. 901, Crepidula 

 costata Say; Fig. 902, inside view of the same; Fig. 903, Yoldia limatula Say, also 

 recent; Fig. 904, Callista Say ana Con.; Pecten decennarius Con.; P. Virginianus Con.; 

 Cardium Virginvmum Con.; Fewws tridacnoides Con.; F. capax Con.; Chama corticosa 

 Con.; Axinaza tumulus Con.; Anomia Ruffini Con. ; also, among living species, Ostrea 

 Virginiana Gmelin, or common Oyster; Fe^MS mercenaria Lam., or common Clam, 

 F. cancellata Gabb, Mactra {Mulinia) lateralis Say; Pecten concentricus Say; Lunatia 

 heros Stimpson; CM'va littera.ta, Lam., Nassa {Tritia) trivittata Say, etc. 



In the marine beds of the Pacific Border. — Some of the species of California, as 

 given by Gabb, are Nassa fossata* Gould, Neverita saxea Con., Cerithidea Calif or- 

 nica* Hald., Turritelh Hoffmanni Gabb, P. variata Con., Machcera patula* Cpr., 

 Tellina congesta Con., Lutricola alta * Cpr., Lucina borealis* Linn., Yoldia impressa* 

 M., Pecten propatulus Con.; with the Echinoderms Clypeaster Gabbii R£m., Scutella 

 Gibbsii R£m. The Miocene of Oregon also contains various species. 



2. Vertebrates. — Fishes. — On the Atlantic Border. — Carcharodon megalodon ; 

 Galeocerdo latidens Ag. ; Hemipristis serra Ag. ; Oxyrhina hastalis Ag. In the Miocene 

 of Ocoya Creek, California, teeth of Sharks, of the genera Echinorhinus, Scymnus 

 Galeocerdo, Prionodon, Hemipristis, Carcharodon, Oxyrhina, and Lamna, besides a tooth 

 of a Zygobates. (Agassiz.) 



Reptiles. — In the Upper Missouri region. — Testudo Culbertsonii L., T. hemi- 

 sphcericaL., T. Oweni L., T. lata L. 

 Birds. ^ On the Atlantic Border. — Puffinus Conradi Mh., in Maryland; Catarractes 



