142 



side, upper jaw. It has its crown ;i little worn at the point; it is plainly "canine" in 

 function as in shape. The enamelled part of the crown which projects beyond the 

 cement measures 1 inch 2 lines along the anterior curve. This is convex lengthwise, 

 angular transversely, being traversed at the fore part by a low ridge (r, fig. 7, Plate VII.) ; 

 the posterior border beyond a slight basal convexity is feebly concave lengthwise, rather 

 flattened across, but chiefly bounded by a longitudinal ridge of enamel near the outer 

 side : this ridge is feebly notched ; the thinner enamel is continued from it, obliquely to 

 the inner side of the crown, where the thicker enamel, of less longitudinal extent than 

 the outer enamel, also developes a trenchant posterior ridge. The entire length of the 

 tooth following the curve is 2 inches 3 lines: the fore-and-aft breadth of the base of 

 the crown is 8 lines ; the transverse breadth 5 lines : it accords, therefore, closely with 

 the anterior incisor preserved in the portion of jaw above described (Plate VII. figs. 1, 2, 

 !. i i). The photograph (No. 28 b) of the outer side of the answerable tooth shows a 

 greater extent of preserved fang, though not quite entire at the end ; the serration or 

 notching of the long outer hind trenchant ridge or edge of the enamel is better marked 

 than in the specimen. Together they concur in demonstrating the effective laniary 

 character of the foremost tooth of the upper jaw of Thylacoleo. 



A tooth in the photograph No. 28 c of upper teeth of Thylacoleo accords with the 

 indications, as to form of fang and basal breadth of crown, afforded by the alveolus sym- 

 bolized in figs. 2 & 3, Plate VII., as of the second incisor (i 2). I have therefore added a 

 copy of it, fig. 9, in that Plate. It shows a root tapering to an obtuse point, 5 lines 

 in length, and a crown 4 lines in diameter at its base, short, subcorneal, and obtuse, 

 and may well be i 2 with a rather longer root from a less aged individual Thylacoleo : 

 the crown of this tooth must project close behind the base of the crown of the front 

 incisor. 



The tooth (Plate VII. fig. 10) from the photograph No. 28 cf, with a fang 10 lines in 

 length, fitting by its fore-and-aft breadth such a socket as that marked c in figs. 1, 2, 3, 

 Plate XL, answers to the indications there given. Another subject of the same photo- 

 graph (fig. 11) is a more perfect canine of the opposite side, its bend of fang being con- 

 trary to that indicated by the right upper socket (c) in fig. 1, Plate VII. 



Accordingly, I conclude the canine, c (Plate VII. figs. 9 & 10), to have a small sub- 

 obtuse subcompressed crown, with a convex front outline from before backward, where 

 it meets the hind shorter border of the crown at an angle which seems to form the rather 

 blunt point of the tooth. The length of the enamelled crown is 4 lines, taken in the 

 tooth's axis along the middle of the crown ; the fore-and-aft breadth of the crown is 

 6 lines ; the fang is an inch in length and rather curved, contracting to an obtuse 

 point. 



Amongst the duplicate cave- teeth are the crowns with portions of the fang of two such 

 canines; the best-preserved fang is similarly curved (Plate VII. fig, 12), with a subtrihedral 

 transverse section ; but this form is more strongly marked in the short enamelled crown, 

 the outer and inner sides meeting, anteriorly, at a trenchant border, strongly curved to 



