214 The American Geologist. October, 1905 
Among the modernized Placentals, we have added noth- 
ing to our knowledge of the supposed Cheiroptera. An im- 
portant step is the proposed transfer to the Insectivora of 
the genus Ilyopsodus winch has long figured among the 
Primates (Wortman 8 ), a relationship which will he settled 
by material now in our possession. Among the remaining 
undoubted Primates (Osborn*) there is the series of Anap- 
tomorphidae which still resemble the Tarsiidae more than 
any of the other lemurs, or true monkeys, although their 
actual relationships are absolutely undetermined. The 
second family of Primates, represented by the Notharctidae 
{Notharctus and Limnotherinm) and other forms, has been 
placed near the South American Cebidae by Wortman 1 , but 
this also requires the confirmation or disproof which will 
soon be forthcoming; if South American relationships are 
established for these Primates, a very much mooted problem 
will be solved. 
Among the Perissodactyla the Titanotheres (Osborn 2 ) 
have split up into four phyla, one of which (Pcdaeosyops) 
died out, while the three remaining phyla independently 
acquired rudimentary horns (Telrnatotherium, Manteoceras 
Dolichorhinus) and apparently gave rise to the evolution 
of the four phyla of great Oligocene titanotheres. Among 
the Artiodactyla the rare Middle Eocene forms still require 
elucidation, but the Camelidae have been traced definitely 
into the diminutive Upper Eocene (Uinta) Protylopus 
(Scott 1 , Wortman 2 ). Two distinct phyla of Oreodontidae 
have also been traced back in the Upper Eocene into the 
genera Protagrichoerus and Protoreodon (Scott). Among 
the enemies of these animals, the Canidae have been traced 
into the Upper Eocene genera Prodaphaenus and Uintacyon 
and Marsh's Middle Eocene Vulpavus has also proved to 
be a member of the true Canidae, although, its relationships 
3 Studies of Eocene Mammalia. Part TI. Araer. Jour. Sci., vol. XV, 
May, 1903, p, 401. 
4 American Eocene Primates, etc. Bull. Amer. Mus. Nat. Hist., vol. 
xvi, 1902, pp. 169-214. 
1 Wortman. Op. Cit-. Amer. Jour. Sci. vol. xv, 1903, pp. 409-411. 
2 The Four Phyla of Oligocete Titanotheres. Bull. Amer. Mus. Nat. 
H.ist., vol. xvi. 1902, pp. 91-109. 
1 The Selenodont Artiodactv/s of the Uinta Eocene- Trans. Wagner 
Free Inst. Sci. Phil., vi, 1899, p. 100. 
