TERTIARY PERIOD. 



519 



4. Vertebrates — («.) Fishes.— Teeth of Sharks.— Fig. 466, p. 277, Carcha- 

 rodon angustidens Ag. ; G. megalodon Ag. ; Galeocerdo latidens Ag. — (b.) Hep- 

 tiles. — Crocodilus macrorhynchus. 



At Red Bluff there is a stratum between the Jackson and Vieksburg beds, 



Figs. 809-815. 



Fig. 809, Pecten Poulsoni; 809, a, section of same; 810, Clypeaster Rogersi; 811, Ostrea Geor- 

 giana (X \Q; 812, Anomalocardia Mississippi ensis ; 813, Orbitoides Mantelli; 814, Cithara 

 Mississippiensis; 815, Dentalium Mississippiense. 



containing many speeies peeuliar to it ; 28 per eent. only are Vieksburg species, 

 while 6 per eent. are Jackson. 



D. Fossils op the White River Group, Upper Missouri. — 1. Mollusks. 

 — Land and Fresh-water shells of the genera Helix, Planorbis, Limnsea. 



2. Vertebrates — (a.) Reptiles.— Testudo Culbertsonii Leidy ; T. hemi- 

 spherical. T. Oweni L. ; T. lata L. — (b.) Mammals. — Fig. 816, Titanotherium 

 Proutii ~L. } one of the teeth, — the last posterior inferior molar, — half natural size. 

 According to Leidy, the genus most resembled the Anoplotherian Chalicothere. 

 Fig. 817, Rhinoceros Nebrascensis L., three posterior superior molars, left side, 

 natural size. Fig. 819, Oreodon gracilis L., skull, young animal, under side ; 

 Oreodon Culbertsonii L. ; also, according to Leidy, species of the genera Machse- 

 rodus (or Drepanodon), Hysenodon, Amphicyon, Dinictis, Leptaretus, of Carni- 

 vores ; Anchitherium, Hipparion, Merychippits, of Solidungulates ; Agriochozrus, 

 Poebrotherium, Dorcatherium, Leptauchenia, Protomeryx, Merycodus, Gamelops, 



