THE COLLECTION OF FOSSIL VERTEBRATES 



<5 



or collateral ancestors of the modern Horses, Asses and Zebras, 

 are in one alcove, arranged in series from the most ancient to 

 the most recent. The most ancient and structurally primitive 

 groups ^i mammals come first, the most modern and familiar 

 types come last. 



South (Right) Side. 



TITANOTHERES 

 Chalicotheres 



Pcrissodactyls 



or Odd-Toed 



Hoofed 



Mammals 



Tapirs 



Lophiodonts 



RHINOCEROSES 



Palaeotheres 



North (Left) Side. 

 AMBLYPODS £ Primitive Hoof< d 

 CONDYLARTHS i" Mammals 

 Monkeys, Bats, Rodents, Insectivorcs 

 and other Small Primitive Mammals 

 Marsupials 



CREODONTS ) Carnivorous 

 CARNIVORES f Mammals 

 Seals, Dolphins, Whales, ) Marine 

 Sirenians etc. ) Mammals 



MASTODONS and ) proboscideans 

 ELEPHANTS S 



ELOTHERES ] 

 Anthracotheres 

 Pigs and Peccaries 

 OREODONTS 

 CAMELS 



Art i( (dactyls 

 or 

 r Even-Toed 

 Hoofed 



HORSES 



DEER etc. 

 Litopterna 

 Toxodontia 

 Typotheria 



Mammals 



EDENTATA J 



I Fossil Mammals 

 y Peculiar to South 

 I America. 



SOUTH (RIGHT) SIDE. 



The south side of the hall is entirely devoted to the Peris- 

 sodactyls or Odd-Toed Hoofed Mammals in which the number 

 of toes (in the hind foot and generally in the forefoot) is either 

 i, 3 or 5, while in the other main division of hoofed animals, the 

 Artiodactyls, it is either 2 or 4; or more exactly, the axis of 

 symmetry of the foot passes through the central toe in Pcris- 

 sodactyls, while in Artiodactyls it passes between two toes. 



The Titanotheres come first in the scries of Perissodactyla, 

 large animals which suggest rhinoceroses in general south Ai- 

 proportions, but have a differently shaped head and cove 1. 

 peculiar teeth. These began as hornless animals of Titan- 

 moderate size- (Cases 1 and 17) and increased in size otheres 

 and developed large bony horns ''Cases ,}, 5 and 19) before they 



