Tertiary.} PALEONTOLOGY OF VICTORIA. IMammalia. 



showing with certainty that in the true Victorian Thylacoleo carni- 

 fex the premaxillo-niaxillary suture crossed the middle of the 

 socket of tlie fourth tooth, and not, as Professor Owen says of 

 the New South Wales specimen, traversing that of the thii'd 

 tooth. I therefore think there can be no doubt that, for the 

 Victorian animal at all events, the third tooth is an incisor {%. 3), 

 far in advance of the premaxillo-maxillary suture, and that the 

 fourth tooth is anatomically the canine. This suture has an irre- 

 gular minute fohaceous or dentated character, and descends on 

 the outer surface of the side of the face nearly in a hue with the 

 posterior edge of the socket of ^. 3, but before reaching it bends 

 abruptly backwards, and crossing the middle of the vacant space 

 of outer alveolar border between i. 3 and the fifth tooth, con- 

 tinues across the middle of the conical fourth tooth, or canine ; it 

 then extends backwards for 2 or 3 lines, then forward to form an 

 acute angle a little behind the line of the anterior margin of the 

 canine, then backwards and inwards to (on one side a little in 

 front, on the other side a little behind the middle of) the incisive 

 or prepalatal foramina, from behind the middle of the inner edge 

 of which the sutures meet from each side across the middle of the 

 palate. 



If the figure of the lower jaws in Plate XII. of Professor Owen's 

 third Memoir be correct, the vertical measurement of the lower 

 jaw from just behind the second molar is much less than its depth 

 from lower edge of anterior end of crown of carnassial in the 

 New South Wales specmien, but is 3 lines more in our Victorian 

 example. A glance at Professor Owen's figure in the Phil. Trans, 

 for 186G, Plate III., will show (if that lie correct), on comparison 

 with our figure, that the New South Wales species difl'ers remark- 

 ably from the Victorian one in the greater space between the 

 second, thfrd, and fourth teeth measured across the palate ; the 

 approximation, especially between the second incisors (the inner 

 edges of the alveoli of the right and left second incisors in the 

 Victorian example in our plate being only 9 lines) being particu- 

 larly striking, and apparently indicating a specific distinction. 

 The second, and especially the third teeth, here called incisors, are 

 also considerably larger in our example than in Professor Owen's 



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