MACHAIRODUS. 



99 



which in this position is more vertical and posteriorly is more oblique. The poste- 

 rior lobe is broad as in Fells, 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 tlae 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. 



Length from occipital condyles to upper incisive alveoli 

 Length from occipital condyles to lachrymal tubercle 

 Height from base of lower jaw to forehead . 

 Breadth of cranium at most prominent part of temporal fossae 

 Breadth of forehead at post-orbitar processes 

 Breadth at ossa malse 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 

 Antero-posterior diameter of second lower molar . 

 Antero-posterior diameter of lower carnassial tooth 



Inches. 



Lilies 



6 



5 



4 



4i 



3 



10 



1 



10 



2 



8 



4 



4 



1 



9 



2 



1 



1 



7 







11 







5J 







10 







3 







6 







Si 



