51 
sions. Each of them is composed by two feet, and 
each foot contains four toes, which are seen more 
distinctly in some impressions than in others. The 
largest of these double tracks is about three inches in 
diameter. Perhaps it would be useless to speculate 
upon what kind of animal they were made by. 
There is a similarity between these and the tracks of 
the Anomcpus Scambus, spoken of in the sixth 
group. In the latter, however, the toes are five and 
three. Some experienced persons think they are 
tracks of the mink, Mustela Lutreola, an animal com- 
mon at the present day in these parts. This has five 
toes; but it may be in this as in some other digiti- 
grades, that one of the toes in each foot does not 
make an impression; or perhaps it is safer to believe, 
till further investigation is made, that it was an ani- 
mal of a construction not now existing. 
The direction of these tracks presents a puzzle we 
are not able to unravel; it exhibits the impressions 
of four toes, and we have supposed it might possess 
five. In either of these cases, we have no right to 
consider it a bird-track, but probably a reptile or a 
mammal. Admitting this to be the fact, we are 
unable to account for the direction of the steps, which 
is not alternate, as in the quadruped, but in straight 
lines. In other words, this animal, supposed to have 
