A MKMOIK UI’ONTJIE GENUS 
TfhutMhcriun, r/z/Zr/V/.w oauws (’ope to place this species lower in tlie scale than 
r fHtIudosHS, altliough Mai-sh’s T. validiis has the internal lobe of this preniolar 
Wfll .levelo|HM|. I have alnwlv thvelt upon the characters of the teeth in Tclma- 
tolheriuni and have shown how innch more nearly they approach those of the cul- 
tiiinatiiiK jseniis of this line ( Titanotherium). J therefore hold that Tclmatolhcrium 
in its ilenl4il characters shows a decided advance over Palceosyops, and a brief 
snniniarv of llies«* will. I believe, pi-ove the correctness of this position. The crowns 
of the molars of Teltmtofheriuni are verv high, and their external lobes exceedingly 
hnwiil ami Hal. wliile practically all traces of the median rib of the external V’s 
have Iss-n h»sl on the np]K‘r true molars of the genus. The e.xternal median hut- 
Inws an* strongly constricted off; the lower true molars, likewise, have their cones 
high, sharp and thin, and their \”s strongl}- developed; this applies espc'cially to 
the conms'ting cn*sts. which aix* .strongly raised above the valleys. The 
|Mislcrior tulMTvle of the last inf. molar is an o])en and functional IoIk* ; it is not 
s|avializ«sl ji.s in /’, paludosus. The last inferior preniolar in Tr/ttiaMhc- 
rmm appn»a«*hes inon* nearly the characters of the true molars than in 
PidtrosYops. The intermediati* position of Tehnatotheriuni^ together with its 
vUm' appnMich to Diplacodon in its dentition is thus demonstrated. liecanst* 
of the internal h.U* to sap. pivmolar 2, 1 regard the species T. cjiilridcns as 
I the latter. That is. T. culfridcns has the intermediate tubercles nearlv 
tmg. wl».n*as in xMis these tubercles are well developed, and there 
well dehned pn.hH-onnle on superior premolar 4, which is totallv 
tmg m /. cuItridcHs. The latter species has also a very rudimentarv hv-piK-om. 
•Anipriosn X«t.in.IiM. IH^.. issT, .\rtiele IVrimslnctyla. 
■II tlie formor siK*cipt> and P. pahidomm. 
represented by jaw Xo. 10,1,S4. The 
nd the posterior tiibereU* of molar 3 
