102 DEUXIÈME ASSEMBLÉE GÉNÉRALE 
rable actual evidence for it in the morphology of the skull of these various 
distinctively American Artiodactyls; but the hypothesis is such a bold 
one that we must wait for more material. 
The chief problem of all, which is also the problem of the European 
Provisiornal Phylogeny of Cahelidae, Old #8 New Worla | 
Worfman , 1478 Mallhienw , 70% 
Pleis Toccerre Camelus Came 0ps Aucherna Camelus Camelps Auchenta 
Plio certe Ph | Carnelus Plauchenia Aue, 120772 
Procamielus Îliearinelus Protamélus CHR 
Miotene M 10 dé: Q [licamelus Profo le bis Miclebrs 
Para lylopu s 
Poëbro lherium 
Olgo cerre 
- 
- 
Leplofraqu lus Prof, opus 
ES is Eee a 
? Honïato don 2 Homacôdon 
L 
ÆEocene 
2? Panblestes > Zanlolrs ls 

Fic. 5 
The Polyphyletic Law and Local Adaptive Radiation Illustrated in the Phylogeny 
of the Camels. 
On the left ïs illustrated the older monophyletie view held as recently as 1898 ; on the 
right, the newer polyphyletie view developed in 1904 showing three distinct contempo- 
rary lines of Camelidæ. 
palæontologists, is the source and origin of the modern Lower Eocene 
fauna as a whole, namely, the Carnivora, Perissodactyla, Artiodactyla, 
Primates, and Rodentia. 
AMERICAN OLIGOCENE FAUXASs. 
Our Oligocene (Lower Oligocene Infra-Tongrien, Middle Stampien, 
and Upper Aquitanien, of Europe) has been the most thoroughly explored 
of any of the periods, owing to the richness of its fossil fauna. 
