500 



CENOZOIC TIME. 



Carolina. The coin-shaped fossils, Nummulites and Orbitoides, es- 

 pecially species of the latter, abound in the Vicksburg beds ; and one 

 species is represented in Fig. 898. 



Figs. 901-904. 

 901 ^gg^Hs^ M3 



Miocene, Yorktown Group. — Figs. 901, 902, Crepidula costata. Lamellibranchs. — Fig. 903,. 

 Yoldia limatula ; 904, Callista Sayana 



The Radiates comprised Polyps and Echini, partly of modern genera. 

 The Mollusks embraced species of Oyster, Venus (Clam), Chama, 



Figs. 905-907. 



Pliocene, Sumter Group. — Fig. 905, Pecten (Amusium) Mortoni ; 906, Area (Scapharca) hians- 

 Gasteropod. — Fig. 907, Cyprsea Carolinensis. 



Area, Voluta, Cyprcea and other modern genera, but no Brachiopods- 

 except Terebratidids and Discince, and no Cephalopods having cham- 

 bered shells but those of Nautilus. There are numerous land and 

 fresh-water shells in the beds of the Upper Missouri region. 



Some of the species of the Middle Eocene (Claiborne group) are 

 represented in Figs. 889 to 893 ; others, of the Upper Eocene (Vicks- 

 burg group), in Figs. 894 to 900. 



Others, of the Miocene and Pliocene, in Figs. 901 to 907. 



Of Articulates, there were Crabs and Insects, of all the modern 

 tribes. 



