10 
As compared with the superior canine of the Duptophilus squalidens, 
which the present specimen resembles ia its compression and fine denticu- 
lation, it differs in its greater relative length and in the presence of the 
lateral open suici. : 
Measurements. M. 
antero-posteriOrs....scecescsneaccas -0120 
Diameter at base | tiaiieverse J greatest eae eae x ~-. .0036 
Umedian...........0. 00s 0082 
Length of a denticle on base. ........0. 0 cece eee eee .000143 
MACHZRODUS BRACHYOPS, sp. nov. 
This species, which ranged in size from that of the puma to that of the 
jaguar, is represented in my collection by parts of two crania ; by an en- 
tire cranium ; by a Jeft mandibular ramus with parts of the skeleton, and 
by several isolated teeth. The characteristics of the molars in both jaws 
are those of the other species of this genus. The first superior pre- 
molar is two-rooted and small, occupying the middle of the short space 
between the canine and the second premolar. The latter is large, and has 
no anterior basal tubercles. Sectorial without anterior basal tubercle. 
Tubercular tooth small, transverse. 
The crania of the three individuals mentioned agree in many particulars ; 
and especially in the very short face and muzzle. This may be more ex- 
actly expressed by comparing the interspace separating the second and third 
premolar from the canine with the length of the base of the latter. From 
this it is seen that the two dimensions are equal, while in the M. prime- 
ous the first mentioned is much the longer of the two. In the mandible 
referred to this species another character is seen in the relatively large 
size of the premolars, which much exceeds that of the corresponding teeth 
in M. primevus. The first is stated by Leidy to have an anterior basal 
cusp, which is wanting in the M. brachyops. 
In the first cranium the sagittal crest is well developed. The canine 
tooth has an oval section at the base of the crown, whose long diameter 
somewhat exceeds the distance between it and the anterior base of the sec- 
ond premolar. The infraorbital foramen is large. The second specimen, 
the left maxillary and part of malar bones with teeth, shows that the 
length of the base of the sectorial tooth equals the space between it and the 
middle of the first premolar. The superior aspect of the proximal portion 
of the malar bone is horizontal, constituting a surface not seen in the spe- 
cies of Felis. The canine is robust, with an oval section at the base. The 
posterior denticulate cutting edge extends higher up than the anterior, and 
ceases it the base of the enamel. The anterior cutting edge is on the in- 
ner side of the anterior face of the tooth. 
Measurements. 
No. 1. M. 
Length of muzzle in front of canine....... 0.6... 000 - -017 
Diaincter of canine aes Dasa f antero posterior. ........ .018 
( trumsverse.........05 vee. OTM. 
Distance from canine to p. M. 2.2.2... e cece ec eee eee eee O17 
