22 W. EH. Logan on an Animal Track, &c. 
quarters. It is often somewhat pointed, and the highest part is 
not always in the middle between the parallel side ridges (fig. 4). 
The concave og s the curve is always on the steeper side of 
the tranverse ri 
There runs nai the track a ridge intermediate between the 
two parallel side ridges, (figs. 3, 4, 5), and though it is not so 
conspicuous as these, it is seldom. altogether wanting, but ap- 
pears to be, most obscure when the transverse ridges, or rounds 
of the ladder, are straight. This intermediate ridge does not 
keep parallel with the side ridges, but,occasionally runs in sinu- 
ous sweeps from within an inch and a half of one side (fig. 5) to 
the same distance from the 
other; sometimes, however, it 
runs nearly parallel with the 
sides for a considerable distance, 
either in the middle-or some- 
the course of the intermediate 
ridge a sudden dislocation of 
an inch and a quarter (fig. 3 
towards the top,) on the oppo- 
site sides of one of the trans- 
verse ridges. The course of 
the intermediate ridge avi 
in general to coincide with th 
successive most salient parts of 
the transverse ridges when these are curved, - this is not al- 
The 
One-fifth nat. size. 
i 
ridges and furrows, though not 
to so great a 
The inner fispkes of the side 
ridges appear to be continuons- 
ly even makin 
angle of 155° with the plane 
of the intermediate spaces, and § 
against these sloping flanks the == 
surface of the transverse undu- 
Be 
an 
inclined plane in the direction = 
of its strike. The side ridges One-fifth nat. size. 
