MACHAIRODUS. 99 
which in this position is more vertical and posteriorly is more oblique. The poste- 
rior lobe is broad as in Felis, but is less oblique at the trenchant margin, which 
also is indented as in the latter genus. 
The crown of the tubercular molar (1) is transversely oblong, as in the Domestic 
Cat, is three lines broad by two antero-posteriorly, and externally forms a mammil- 
lary tubercle, and posteriorly a smaller one. 
As previously mentioned, the symphysis of the lower jaw, with the incisors and 
canines, is broken away from the specimen. 
The portion of tooth supposed to be part of an inferior canine (4, 5) is of the 
right side. It corresponds in its form and relative size with that of Machairodus 
neogaus ; having a curved demi-conoidal crown, with the postero-internal side defined 
by longitudinal ridges, of which that external is most salient. At the enamel 
border this tooth measures three lines antero-posteriorly and two transversely. 
The first inferior molar (3) is relatively very much smaller than in Felis, and in 
form it is like that of Machairodus cultridens ; the crown being compressed conoidal, 
with a small simple basal lobe anteriorly and posteriorly. 
The second molar (3) is less robust in its proportions than in Felis, and has the 
same form nearly, very much increased in size, of the first tooth; for the posterior 
lobe,-though broken in the specimen, appears to be quite simple, or it is without 
the prominent heel existing in the latter genus, and the division possessed by 
Machairodus neogaus. 
The inferior carnassial tooth (3) is quite peculiarly modified from the feline 
type, and if it had been found as an isolated and unique specimen, it would cer- 
tainly have led to the separation of the species from the genus Machairodus. 
It possesses the two characteristic lobes, separated by a large angular notch with 
trenchant margins, as in Felis, but the slight posterior heel of this genus is developed 
into a broader lobe than that occupying a similar position in the tooth in advance. 
This third lobe is more than half the length of the crown, is depressed externally 
and notched at its upper posterior angle. It exists only in a rudimentary condi- 
tion in Machairodus neogaus. 
MEASUREMENTS. 
Inches. Lines. 
Length from occipital condyles to upper incisive alveoli i : ° ee) 5 
Length from occipital condyles to lachrymal tubercle. : 5 : abu ee 43 
Height from base of lower jaw to forehead . : : : . : - 10 
Breadth of cranium at most prominent part of temporal fossee 10 
Breadth of forehead at post-orbitar processes 
Breadth at ossa male below their orbitar processes 
Breadth of face from inner side of infra-orbitar foramina 
Breadth at most prominent part of the canine alveoli 
Height of coronoid process from base of lower jaw 
Height of latter below first molar : 
Antero-posterior diameter of second upper molar . 
Antero-posterior diameter of upper carnassial tooth 
Antero-posterior diameter of first lower molar 
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Antero-posterior diameter of second lower molar 
Antero-posterior diameter of lower carnassial tooth 
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