280 THE PUERCO FAUNA. 



of base of last molar, .010; do. of canine, .007; depth of ramus at last 

 molar, .018; of diastema, 015. As large as, but more robust than, the 

 red fox. 



The third specimen above mentioned is somewhat injured by pressure, 

 but exhibits the following characters The sagittal crest rises from an 

 ascending frontal region, so that the profile is concave. The muzzle is short, 

 and is contracted behind the alveolae of the canine teeth. The latter are 

 prominent, and the premaxillary region is short and rather wide. The super- 

 ciliary ridges are rather promirtent and terminate in postorbital angles, which 

 are rather prominent. This is due to the abruptness of the convergence of 

 the anterior temporal borders, which are angles, and not ridges. The ante- 

 rior, and probably the posterior, part of the brain cavity is tery narrow. 

 The postglenoid process is prominent, and there is no ti-ace of preglenoid 

 ridge. There is a large postglenoid foramen, and the infraorbital foramen 

 issues above the middle of the third premolar. The lachrymal foramen is 

 small, and is entirely within the jireorbital border. The posterior nareal 

 opening is small, not exceeding in width the space which separates it on each 

 side from the internal border of the last molai*. 



Of the three incisors the external is the least, and it is separated by a 

 wide diastema from the canine. The latter is large and the crown is 

 directed vertically downwards. The crowns are mostly broken off, but 

 enough remains to show that the posterior edge is acute, and is bounded 

 within by a wide, shallow groove, and by a less marked groove externally. 

 There is a distinct but short diastema behind the canine. The first (sec- 

 ond) premolar is a flattened acute cone, with an acute posterior edge. The 

 base of the third premolar is triangular in section, but the internal pi'ojec- 

 tion does not support a cusp. The anterior and posterior basal cusps are 

 nidiinental. The fourth premolar has an internal cusp which sends a ridge 

 downwards and outwards on the anterior side of the crown. There is an 

 anterior but no posterior basal lobe, which does not rise into a cusp. Pos- 

 terior or basal cingulum weak. In the true molars the posterior external 

 cusp is connected with the corresponding external angle of the crown by a 

 ridge, while the anterior cusj) is not connected with the anterior angle. 

 The external cusps are set in further on the second than on the first true 



