518 



CENOZOIC TIME — MAMMALIAN AGE. 



2. Radiates (a.)Corals. — 0cw7iHa(Madrepora) Mississippiensis ; 0. Viclcs- 



burgensis ; Turbinolia caulifera Con. — (6.) Echinoderms. — Fig. 810, Clypeaater 

 Rogersi 



3. Mollusks — (a.) Conchifers.— Figs. 809, 809 a, Pecten Poulsoni ; fig. 

 811, Ostrea Georgiana, one-fourth linear dimensions j 0. Vicksburgensis Con. ; 



Fig. 808 A. 



Tooth of Zeuglodon cetoides (%). 



fig. 812, Anomalocardia Mississippiensis Con. ; Barbatia Mississippiensis Con. ; B. 

 Lima Con. ,• Cardium diversum Con. ; Crassatella Mississippiensis Con. ; Panopcea 

 oblongata Con. — (b.) Gasteropods. — Fig. 814, Cithara Mississippiensis Con. ; fig. 

 815, JDentalium Mississippiense Con.; also twelve species of Pleurotom ides, four of 

 Triton, five of Mitra, etc. 



