340 
A MEMOIR UPON THE GENUS 
tlie size of this metapodial, especially the posterior one. The facets for the meta- 
carpal V are also large and inclined to each other. The size and proportions of 
the above metatarsals indicate that P. lo?igirostris had a short and broad manus 
like that of P.paludosus hut much shorter. It also resembles the latter species in 
having wide-spreading digits to the manus. The two carpal bones that have been 
just described also point to a carpus with a considerable transverse breadth and a 
much shorter vertical diameter. 
Measurements of Lower Jaws. 
P. minor. 
P. longirostris. 
Total length from posterior border symphysis to pos- 
M. 
M. 
terior border of ramus 
•250 
•270 
Length of ascending ramus behind molars on a hori- 
zontal line ..... 
•102 
•1.30 
Depth of ramus below last molar 
•068 
•066 
Length of entire inferior molar series 
■164 
•155 
Length of true molars ■ . • 
•100 
•001 
Last molar ft™''®- ’ ’ ' ' 
•022 
•020 
(, ant-post. ..... 
•041 
•042 
TELM ATOTHERIUM . 
(Sj'n . — Leurocqplialus S. and O.) 
This genus was established by Marsh' in 1872 the type species being his T. 
validus in the Yale College Museum. Later Scott and Osborn^ described their 
genus Leurocephalus, which, as I have already stated, I find upon comparison with 
Marsh’s type specimen to be the same as Telniatotherium, of which it is therefore a 
synonjun. 
Genejdc cluiracters. Dentition. — The upper incisors of this genus form a continu- 
ous series and incTease in size from within outward. The basal portion of their crowns 
is nearly circular in section, with a posterior and very prominent basal ridge. The free 
extremity of the crown is pyramidal in form, being deeply excavated posteriorly. 
The canines are long and slender with very prominent anterior and posterior cutting 
edges. The canines in this genus are very different in form from those oi Paleeosyops 
where they are nearly round in section and without cutting edges. A pre- and post- 
canine diastema may be present. The crowns of the superior premolars are higher, 
and they are provided with sharper cutting lobes than in Palceosyops. The external 
lobes of all the premolars are straight, and the last does not show the median but- 
tress which is so characteristic of some species of Pcilceosyops. The first premolar 
is a two-fanged tooth with an elongated and comjjressed crown ; a rudimentary 
posterior heel may be present. In Palceosyops premolar 1 is generally a simple 
cone. The second premolar may be provided with a well developed internal lobe, or 
'Am. Jour. Sci. and Arts. 1872, vol. 4. 
'Princeton Scientific Expedition of 1877, Pub. Sep. 1st, 1878. 
