A MK.MOIli UPON THE GENUS 
tl... i.n-iiiolurH aiv without i-ingula. The crowns of the inferior molars of P. pdu- 
iiosusxxn' low aii.l very l.road, they differ in this respect from tliose of Telmatothe- 
num, when* the form Id' the molar is very hish and elongated. The valleys between 
the IoIm-m in this sis-eies ai-e shallow and the molar cusps do not project so much 
ulsive them as in those of Tehnatotheriuni. The crests of the V’s are weakly 
ileveloiMtl and «lo not present such sharp cutting edges as seen in the last mentioned 
genus. We have in the last inferior molar a very characteristic tooth in this 
sjH-ei.*s. ami one which readily di.stinguishes it from P. ininar and the differ- 
«*nt s|H*«-i«-s of Telniatotheriuiu. In the typical form this molar is unusually broad and 
heavv ; its en»wn is very low comi)ared w'ith that of Tebnatotherium. The posterior 
tuU-n-le of the last inferior molar is simply a small cone placed in the middle axis 
of the tiM>th, ami is connected with the entoconid of the molar b\' a feebly marked 
rn‘st. A lower jaw of another individual of this species, No. 10,118, shows consider- 
able variation in the characters of the last molar. In this specimen the crown of 
the t<M)th is much narrower, and the diameter of its posterior tubercle is nearly as 
gnait us that of a whole t«s)th. In this variety the posterior tubercle is still a cone. 
I have ex'uinined at least si.\ jaws of this species, and they all correspond in the 
linaid form of the molars and small .size of the tubercle of the last molar. 
'Fkkth .Mk.vsi-kkmk.n't.s ok Pal^osyops and Limnoiiyops. 
l*|l|HT JbW. 
P. puludustw 
L. laticeps. 
j P. Isevidens. 
P. raegarhinu 
j| P. minor. 
Knllrp iiMilar PBritw 
•172 
•155 
•140 
•148 ~ 
1 -153 
of tnip uioIbth 
102 
•095 
•085 
•085 
' -085 
•070 
•064 
•056 
•066 
• -066 
, . i •™ms- • 
■024 
•026 
•022 
•021 
( an(. |Minl. 
•021 
•020 
•019 
— 
•018 
M-OBrll'""” 
1 -(KIO 
•031 
•029 
•023 
(■III. IHWI. 
j -osi 
•030 
•026 
•025 
%i • of irniui .... 
Molar .I 1 
( 044 
•045 
■036 
•039 
•035 
1 ant. |Kwl. 
■o;m 
•041 
■039 
■037 
■036 
ir/mr Jaw. 
Knliir inntar M'rirw 
•187 

•157 
la>ninli of pn'molars 
•082 

•063 
l.t'nfftli of Inis iiiolarH . 
•107 


•100 
VI ■ of •rsns 
M<4ar .It 
•024 

•020 
( ant. iMmt. 
•047 
•040 
Molar 3 tula-rrln | 
•012 

■010 
( ant. ixwt. 
Jaw 
•013 
-- 
-- 
•010 
Total lonxtii of Jaw 
•364 
•300 
•068 
.060 
Ivptli twlow last molar 
ls<n«lh of symplimia 
ilnwith of symphysis below Ist 
•075 
•085 
premolar .... 
•067 1 
1 
-- 
