41 
explanation of plate 26 ”. 
Fig. 1. Ornithichnites giganteus. Many tracks of this 
^ecies occur at Mount Tom, near Northampton, 
g. 2. O. tuberosus. Portions of three tracks, and a 
single footstep of a fourth appear on the same slab. 
The two longest of them are in opposite directions, 
ig- 3. O. tuberosus, on a slab in front of the Court 
House in Northampton, from Mount Tom. 
Fig. 4. O. ingens, from a quarry called the Horse Race, 
near Gill. The appendage to the heel is not dis- 
tinct in this track. 
Fig. 5. O. diversus, on a flag-stone near the first church 
door at Northampton, U. S. 
Fig. 6. O. diversus. We have here three rows of tracks 
and a single footstep, from the Horse Race Quarry. 
These tracks shew no marks of any appendage to 
the heel. 
Fig. 7.0. diversus; found near South Hadley, U. S. 
ig- 8. O. diversus; curvilinear track from the Horse 
Race Quarry. 
Fig. 9. O. diversus. Two parallel tracks from the Horse 
Race Quarry. 
Fig. 10 . O. diversus; nearly parallel tracks of two birds, 
with an appendage behind each foot; from the 
^ quarries at Montague, U. S. 
ig. 11. O. minimus; common at the Horse Race 
Quarry; similar impressions of the feet of small 
birds vary from half an inch to an inch and half 
in length. 
Figs. 12. 13. 14. O. diversus; from the Horse Race 
uarry. Tracks of different individuals of different 
species, and different sizes cross one another con- 
Pj tusedly in these three slabs, 
g ff. Recent track of probably a Snipe. 
