A 
Measurements. 
No. 2. M. 
Length of base of series to canine................00005 062 
" ‘“ “second premolar...........22.02000 .018 
“e sectarian... one ablnnaala Bre Uaesswineoats 025 
Elevation to summit of infraorbital foramen............ -033 
The characters displayed by the second cranium lead me to suspect that 
it isthat ofa female. A striking feature of the superior dental series is the 
small size of the canine, which is also not much compressed at the base. 
As regards the cranium, the sagittal crest is only distinct over the posterior 
part of the brain case ; the zygomata are not very widely expanded, and 
the muzzle is narrowed. The external infraorbital foramen is large. 
The mental border of the mandibular ramus is not flared downwards 
but is continuous, but the external is separated from the anterior and in- 
ferior faces by strong angles. The diastema is long. Three molars, all 
large ; the first without anterior basal tubercle, the second with a large one. 
Sectorial tooth the longest, with well developed simple cutting heel. 
Measurements. M. 
Total length of cranium............ 0s eee eee eee eee 192 
Greatest: width“ avishesa seca eeedaceeus ua iney 123 
Length of dental series with canine..... silane hrs siete aralatee O77 
Diameter ef canine. at base! antero-posterior.......... 012 
(transverse, .......2..0005 -008 
Distance between canine and second premolar.......... .019 
Length base second premolar... 2.2... 0... e cece eee eens -019 
Length base sectorial....... swe dalegees Aeneas ve ea eas 023 
Length inferior dental series, with canine............... (94 
" - QiASteMass iv ees scvadstiaes eke gameews 025 
Length base of first premolar. ...........-00 cee cece eee O15 
ae Sf “SCCtUTI AD wis nase haa aeeanaeiace aaa .027 
Depth of ramus below second premolar...............- 082 
ve «ce superior canine............0 00 027 
This sabre-toothed tiger is larger than the Macherodus primevus, and is 
more like the animal indicated by a fragment of the lower jaw named by 
Leidy, M. occidentalis. But the latter agrees with the M. primevus in the 
relatively small size of teeth, especially of the first premolar, and in their 
oblique position, characters not seen in M. brachyops. 
PERISSODACTYLA. 
ANCHITHERIUM EQUICEPS, sp. Nov. 
This animal is represented by a portion of the skeleton including a com- 
plete cranium of one individual with mandibular rami of several others 
The characters of the species are well marked, and do not. approach very 
nearly to those of any other known to me. 
The skull is considerably larger than that of A. batrdi, and the length 
