NIMRAVIDuE. 957 



The first supeinor premolar is one-rooted, and is of moderate size. The 

 second is two-rooted and is small. The third is abruptly larger. The ante- 

 rior face of its principal cusp is wide, and has no basal lobe ; it is not trench- 

 ant posteriorly. The heel is long and rather obtuse. The fourth premolar 

 or sectorial is relatively large. There is no anterior basal lobe, and the 

 internal lobe is small. The cusp is robust, and not very acute posteriorly. 

 The heel is long. The true molar is of medium size, and its external face 

 reaches the line of the external faces of the premolars. Its grinding face 

 is oblique upwards and backwards. 



The inferior incisors are much like the superior, excepting the external 

 one, which is only about twice as large as the others, and of the same form. 

 The section of the inferior canine is nearly the quarter of a circle, the angle 

 looking backwards from the inner side. It is much larger than the superior 

 external incisor. The first inferior premolar is one-rooted, and its alveolus 

 is as large as that of the first superior premolar, and is situated close to 

 that of the second. The second (third) is quite large ; it has an anterior 

 basal angle, and a short posterior heel, but no posterior lobe of the prin- 

 cipal cusp. The last premolar is larger. With the inferior sectorial it is 

 concealed in part by the superior teeth, as the lower jaw has not been 

 removed from its position. The posterior part of the sectorial shows a dis- 

 tinct, rather acute heel, like that of the Nimravus hrachyops. The tuber- 

 cular or second true molar is small and obtuse, and is directed more ante- 

 riorly than superiorly, owing to its situation on the base of the coronoid 

 process. In all the teeth the enamel is smooth, and there are no cingula. 



Measure/nints of skull. 



M. 



Axial length from occipital condyles to premaxillary bonier 180 



Axial length from iuion to premaxillary border 191 



Axial length from premaxillary border to canine tooth 008 



Axial feugth from premaxillary border to anterior border of superior sectorial 0.'58 



Axial length from premaxillary border to palatal border 075 



.Vxial length from premaxillary border to end of maxillary bone. 080 



Axial length from premaxill.ary border to postglenoid process 135 



Length of nasal bone from notch 050 



Length of sagittal crest from iniou 064 



Width of premaxillary bones at canines 034 



W'idth of anterior nares 027 



Width of n.asal bones at middle 020 



Least width between orbits 028 



Width at postorbital processes 060 



Width behind postorbital processes 034 



