Tertiary.-] PALiEONTOLOGY OF VICTORIA. \_MammaUa. 



third Memoir on the New South Wales form in the Phil. Trans, 

 for 1871, Plate" 11. ; and the position of the premaxillo-maxillary 

 suture is described and figured in so much more forward a 

 position, that the conclusion seems inevitable that the species are 

 distinct : the length of the premaxillary part of the bony palate is 

 1 inch ]0 lines in our specimen, but is given as only 1 inch 7 

 lines in Owen's second Memoir on the New South Wales skull, in 

 consequence of the different position of the suture forming its 

 posterior boundary. The fourth tooth, here called canine, seems 

 larger in ours than in the New South Wales specimen, illustrated 

 in the above quoted second and third Memoirs. 



From the Pliocene Tertiary of Lake Colungulac, Hampden. 



Explanation of Figures. 



Plate XXI. — Fig. 1, view from below, of pal.ite of mouth, showing the broken basal por- 

 tions of the two anterior great laniary tusks (/. 1), with the two following incisors (e. 2), with 

 the following large third incisor (i. 3) perfect on one side, broken on the other ; followed by 

 the small conical pointed canine tooth (c), behind which, on one side, may be seen remains of 

 the alveoli of the two small premolar teeth (p. 2 and p. 3), natural size. (The median and 

 premaxillo-maxillary sutures and incisive for.amina in the palate are concealed by hard adhering 

 Diatri.x in this figure, made before those parts were cleared with acid as in the woodcut.) Fig. 

 la, same specimen viewed in front, showing the sutures of the nasal bones above, with the 

 relative place of the anterior incisors. Fig. 16, same specimen viewed Laterally, showing the 

 relation of the three incisors (i. 1, i. 2, and i. 3), and their isolation as a group from the canine 

 (c). (In this figure the premaxillo-maxillary suture is obscured by adhering matrix). Fig. 2, 

 portion of mandible, showing the great carnassial or compressed premolar (p. 4), with the 

 dental foramen under its anterior end, followed by the first true molar (m. 1), the crown of 

 which is worn (by attrition with the carnassial of the upper jaw) into a surface continuous 

 with that of the preceding carna.ssial. Behind this is seen the broken base of the small second 

 molar (;«. 2). The swelling at the right-hand end of the figure indicates the base of the ascend- 

 ing ramus. Lateral view natural size. Fig. 2a, same specimen viewed from above, showing in 

 addition to the above the anterior premolar (j> 3). (In this figure the incidence of the light 

 does not allo\v the faint vertical ridges of the basal portion of the inner side of the crown of 

 the carnassial (p. 4) to be seen with suflScient distinctness.) 



Frederick McCoy. 



[ 12] 



