TERTIARY PERIOD. 



51" 



Crassatella alta ; fig. 800, Astarte Conradi Dana; fig. SOI, Cardita planicosta, 

 from Canada de las Uvas in California, as well as east of the Mississippi, 

 and Europe (C. dennata Con.); C. Blandingii ; C. rotunda ; Caixlium Nicollcti. 

 —(b.) Gasteropoda— -Fig. 802, Turritella carinata Lea; Calyptrophorus {Rostel- 

 laria) velatus ; Pseudoliva vetusta Conrad; Orbis Rotella ; Natica ^Etites Con. 

 (Californian, as well as east of the Mississippi); Anolax gigantea, Olivella Ala- 

 bamensis, Marginella Jarvata, Volutilithes ( Voluta) petrosa, Corbida gibbosa.— 

 (c.) Cephalopods. — Nautilites Vanuxevii Con. 



2. Vertebrates Fig. 465, p. 277, Lamna elegans Ag.; fig. 467, Notidanm 



primigenius, from Richmond, Va. 



Brackish-water beds of the Upper Missouri.— Figs. 803, 803 a, Corbida (Pota- 

 momya) mactri/ormis M. & II.; fig. 804, Corbicula intermedia M. & II.; fig. 

 805, UniojJriscus M. & H. ; fig. 806, Vivipara rctusa M. & H. ; fig. 807, 3/elania 



Figs. 803-808. 



Coxchifers.— Figs. 803, 803 c, Corbula (Potamomya) mactriformis ; 804, Cyrene (Corbicula) 

 intermedia; 805, Uiiio priscus. Gasteropods. — Fig. 806, Vivipara retusa; 807, Melauia 

 Nebrascensis ; 808, Vivipara Leai. 



Nebrascensis M. & H. ; fig. 808, Vivipara Leai M. & H. Also, among Verte- 

 brate fossils, scales of Lepidotus ; bones of Turtles of the genera Trionyx, Emys, 

 Compsemys ; a species of Crocodilus. 



B. Jackson Epoch. — 1. Radiates — [a.) Corals. — Flabellum Warlesii Con.; 

 Endopachys Maclurii Lea. — (b.) Echinoderms. — Species of Hemiaster, Chjpeaster. 



2. Mollusks — («.) Conchifers (Species common to the Jackson and Vicks- 

 burg epochs are marked with a dagger [f] ). — Venerieardia planicosta Con.; 

 V. rotundaf Lea; Cardium Nicolleti Con.; Corbida bicarinata Con.; Leda mul- 

 tilineata Con.; Callista sobrinaf Con.; C. imitabilis Con.; Mactra funerataf 

 Con.; Psammobia linteaf Con. ; Navicula Lima~\ Con. — (b.) Gasteropods. — Ca- 

 lyptrophorus velatus Con.; Cyprpea fenestralis Con.; C. linteaf Con.; C. spjhe- 

 roidesf Con.; Conus tortilis Con.; Gastridium vetustum Con.; Mitra Millingtoni 

 Con. ; If. dumosa Con. ; Voluta dumosa Con. ; Natica Vicksburgensisf Con. ; 

 Turbine.lla Wilsonif Con. ; Dentalium Mississippiensef Con. 



3. Vertebrates — Teeth of Sharks.— Fig. 808 A, Tooth of Zeuglodon 

 cetoides, natural size. 



One-sixth of the species occur in the Vicksburg beds, and several in the 

 Claiborne. 



C. Vicksburg Epoch.— 1. Protozoans — Rhizopods.— Fig. 813, Orbitoides 

 Mantelli, small specimen. . 



