518 



CENOZOIC TIME — MAMMALIAN AGE. 



2. Radiates (a.) Corals. — Oculina (Madrepora) llississijjpiensis ; 0. Vichs- 



burgensis ; Turbinolia canlifera Con. — (6.) Echinoderms. — Fig. 810, Clypeaster ? 

 Lyelli. 



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

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



Fig. 808 A. 



Tooth of Zeuglodon cetoides (%). 



fig. 812, Area Mississippiensis Con. ; Navicida Ifississippiensis Con. ; JSf. Lima 

 Con. ; Cardium diversum Con. ; Crassatella Ifississtppiensis Con. ; Panopsea ob- 

 longata Con. — (b.) Gasteropods. — Fig. 814, Fulgoraria Mississippiensis Con. ; 

 fig. 815, Dentalium Mississippiense Con. ; also twelve species of Pleurotoma, four 

 of Triton, five of Mitra, etc. 



