BY C. W. DE VIS. 445 



remarkable of the true molars and might easily be mistaken for 

 the last molar of a large Sarcophilus : is is similar in shape, witli 

 diameters as 9 : 5, entirely without inner or posterior cusps, and 

 shorter than the remainder of the tooth in the living species ; the 

 premaxillary, measured at the anterior edge of the alveolus of the 

 canine, is 4 mm, or f broader than in T. cynocephalus ; the length 

 of the premaxillary from the anterior end of the nasal is 44*5 mm., 

 against 40-5 mm. In the posterior region of the skull the occipital 

 condyle is relatively large, 25 mm., against 20*5 mm. in length, or 

 nearly \ longer ; the paroccipital process is strong and directed 

 downwards and backwards at an open angle, instead of being 

 nearly perpendicular; the supraoccipital and exoccipital crests are 

 continuous, with but a slight emargination over their junction ; 

 the zygomatic process of the squamosal has its posterior surface 

 inclining backwards instead of forwards, and consequently closing 

 up to a great extent the space between it and the exoccipital crest. 

 Mandible : The total length of the mandible is 193-5 mm. 

 against 191-5 mm., the two species thus approaching much more 

 nearly to equality in this measurement than in the length of the 

 cranium ; its depth below the first premolar is 24 mm. against 

 18 mm., the animal had therefore a much deeper chin ; the total 

 length of the dental series is 118-5 mm. against 116-5 ; the total 

 length of the premolar and molar series is 99 mm., or practically 

 the same as in the recent jaw, in which it measures 98-5 mm. ; 

 the length of the last molar is 17-3 mm. against 16-6 mm. ; from 

 the hinder surface of the last molar to the origin of the revolute 

 inferior edge of the outer crotophyte fossa the length is 43-3 ram. 

 against 51 mm. ; the least width of the hinder surface of the 

 condylar process is 11 mm. against 14*5 mm. ; the anterior orifice 

 of the dental canal is almost wholly in advance of the second 

 premolar instead of beneath the posterior half of that tooth ; the 

 coronoid process rises at a higher angle ; the third incisor is 

 separated by an interspace from the canine ; this latter is scarcely 

 smaller than the canine of the upper jaw and is less curved than 

 in the recent species ; the first and second premolars are separated 

 by a longer interspace. 



