TERTIARY PERIOD. 



519 



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

 rodon angustidens Ag. ; C. megalodon Ag. ; Galeocerdo latidens Ag. — (b.) Rep- 

 tiles. — Crocodilus macrorJiynchus. 



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



Figs. 809-815. 







&-^+:W;^&vCBtj 



Fig. 809, JPecten Poulsoni ; 809 a, section of same ; 810, Clypeaster ? Lyelli ; 811, Ostrea 

 Georgiana (X \Q', 812, Area Mississippiensis; 813, Orbitoides Mantelli; 814, Fulgoraria 

 Mississippiensis ; 815, Dentalium Mississippiense. 



containing many species peculiar to it ; 28 per cent, only are Vicksburg species, 

 while 6 per cent, 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 — («.) Reptiles. — Testudo Culbertsonii Leidy j T. hemi- 

 sphericalt.; T.Owenili.; 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), Hyeenodon, Amphicyon, Dinictis, Leptarctus, of Carni- 

 vores; Anchitherium, Hipparion, Merychippus, of Solidungulates ; Agriochcerus, 

 Poebr other ium, Dorcatherium, Leptauchenia, Protomeryx, Merycodus, Camelops, 



