PAL.EOSYOPS LEIDY, AND ITS ALLIES. 
347 
quite an angle with the horizontal part. In P. paludosus there is no such 
angular portion to the jaw, and the chin is more rounded than in T. cultri- 
dens. The middle third of the posterior border of the jaAv is not inflected in 
T. cultrideiis, but the border is thick, convex and straight. The internal face of 
the jaw is of more equal diameter throughout than in P. paludosus, it having no 
long and convex border just below the molars as in that species. The symphysis 
Teeth and Jaw Measurements of TELMATornERiUM. 
Upper Jaw. 
T. validus. 
No. 10,184. 
T. cultridens. 
P. vallidens. 
T. hyogna- 
thus. 
M. 
M. 
M. 
M. 
M. 
Entire molar .series ... 
■220 
— 
•190 
— 
— 
Length of true molars . 
•130 
■111 
Length of premolars . . . 
•090 
■085 
r trans. 
•020 
•019 
[ ant.-post. 
•025 
— 
•021 
— 
^ f trans. . 
•032 
•027 
-- 
-- 
ant. post. 
•028 
— 
■023 
— 
f trans 
Molar 11 
[ant.-post. 
•037 

•031 


•038 
•033 
f trans 
Molar III i 
•050 
■046 
[ant -post . . . 
Lower Jaw. 
•051 
•045 
Entire molar series 
■178 
•202 
•242 
Length of true molars . 
•105 
•121 
•141 
Length of premolars 
•075 
•077 
•100 
.... f length 
— 

•023 
•024 
Premolar II . . . 
-- 
•021 
f trans. 
Premolar I\ j 
•015 
[ ant.-post. 
— 
•023 
f ant.-post. 
Molar I -1 
•029 
[ trans 
— 
— 
•018 
— 
— 
•048 
•055 
•057 
■063 
Molar III ‘ ^ 
[trans 
■018 
•022 
■022 
•026 
. r ant.-post. 
Molar III tubercle 1 
•014 
•015 
•018 
1 trans. . 
— 
■013 
•014 
— 
•017 
Length of diastema before pm. I . 
•012 
•030 
Length of dia.stema behind pm. I . 
Jaw. 
— 
— 
■006 
•017 
Total length of jaw 
■345 
•380 
■420 
■470 
Depth below last molar at middle 
•060 
■070 
■083 
■088 
Length of symphysis 
•085 
•100 
■122 
Breadth of symph. between pin’s I 
•040 
•050 
•062 
Width of lower incisors 
- 
•075 
is more elongated and horizontally placed than in P. paludosus, but not as 
much so as in T. hyognathus, which is the largest species of this genus. The region 
between the premolars and canines is strongly compressed, and the diastemas present 
are much smaller than in the larger species. The position of the posterior limit of 
46 JOUR. A. N. S. PIIILA., VOL. IX. 
