FOSSIL VERTEBRA TES— MAMMALIA 837 
series which are scattered widely over Europe, Asia, and Africa, 
and displayed a remarkable specialization. (4). The most 
aberrant family is the Elasmotheriinz, thus far found only in 
the Pleistocene of Siberia.”’ 
DISTRIBUTION TABLE, AMERICAN HORIZONS. 
Lower | Middle | Upper |Oligocene| Lower Aree 
Eocene | Eocene | Eocene White Miocene Tone 
Wasatch | Bridger | Uinta River | John Day Fook 
I. HyRACODONTID. 
Hyrachyine 
laynal Chit Sheeyeverseu selec ect keyay ae 
Golonoceorsemeeeeecee eee 
Triplopodine. 
[Maso vie oadoouuece|| coal Goodie * 
Hyracodontine | 
Ebyracodoniye-c mye |ercuskaeuaren |leessenard cell ethe eee x 
Il, AMYNODONTID& 
AMIMANOKVN Go 860000!) vodo de x 
Metamynodon....... Snadon | ecoocol wanese x 
Cadurcotherium * 
III. RHINOCEROTID 
PACED UULEVLUH Epes Mare esta || ee taeetaraueel |e Satetona baa ll cereus x 
Rhinocerotine. 
The superfamily TITANOTHEROIDA, with the single family 
Titanotheride is generally divided into two subfamilies, the 
Paleosyopine and the Titanotherine. Yhe group seems to have 
developed in the later Eocene time, and to have reached its 
greatest development in the Miocene near the middle of which 
time it disappeared. Starting with forms about the size of the 
Tapirs of modern time the animals gradually increased in size 
until at the time of their extinction they had reached elephan- 
tine proportions. In general appearance they must have been 
similar to the Tapirs, with a broad, heavy body, stout limbs and 
along upper lip. The brain cavity was small, and the brain was 
probably devoid of deep convolutions. The group reached by 
far its greatest development in North America, but a few forms 
have been discovered in the Upper Eocene and the Lower Mio- 
*Phosphorites of Quercy. 
