AimODACTYLA. 
359 
Measurements. 
- 
. Longer diameter at the base of the fragment of the horn. .. ..... 0. 020 
Longer diameter at the distal end of the same..... 0. 016 
Length of the symphysis mandibuli.... 0. 048 
Transverse diameter at the middle.... ..... t. 0. 020 
Length of the dentigerous portion....... 0. 025 
Diameter of the rib below the tubercle.. .... 0,023 
Length of the tubercle of the same ....... 0, 022 
Diameter of the acetabulum.^... 0. 045 
Vertical diameter of the symphysis pubis ..... 0. 028 
Vertical diameter of the symphysis ischii..... 0. 026 
Width of the ischium from the obturator foramen to the posterior bifurcation. 0. 038 
Transverse diameter of the sacral centrum anteriorly.... 0. 045 
These remains indicate a robust animal, bearing the relation to the 
D. teres that the Red Deer does to the' Virginian Deer. The material pre¬ 
served renders it probable that the horns differ in form from those of D. 
teres. 
Dicrocerus tehuanus, Cope. 
Plate Ixxxii, figs. 10-? 12. 
Several mandibles, found in the same deposit as the species already 
described, show that an allied form existed of smaller size. The jaws differ 
among themselves in size, so that it is not entirely certain that they all 
belong to one species. I have selected as typical a jiortion of a right ramus 
which dis’plays the least dimensions. 
This fragment supported the first four molars. Those which remain 
are well worn, indicating maturity. The ramus has the proportions of that 
of J). necatus, with the portion at the posterior part of the diastema similarly 
stout. The mental foramen is well in advance of the second (first) premo¬ 
lar, Length of premolars 0™.016; of first true molar 0“.0076; depth of 
ramus at first true molar 0“.013. The posterior part of the ramus of the 
same side accompanies the anterior part. It is not certain that it is part of 
the same ramus. Its dimensions are those of D. necatus. Length of tooth 
0"\0155; width O^.OOSS. 
In a second specimen, which displays corresponding parts, witli the 
addition of the second true molar, the length of the premolar series is a 
little greater, viz, 0“.017; length of second true molar 0“.010; depth of 
ramus at first true molar 0'“.012. 
A third specimen is a large part of a right ramus supporting all but 
