280 . Dr. Deane's Illustrations 
ep that the form of the heel, or metatarsal protuberances, is 
lso impressed. There is a numerous class of impressions at 
Turner's Falls, having a strong family likeness to this species, - 
differing but little except in size. It consists of all grades, . 
from that of the plate down to two inches in length, having 
the same thick, stout toes, blunt nails and heel depressions. 
So intimate is the resemblance that it is impossible to separate 
them into specific divisions. As an existing fact of their being 
merely different individuals of the same family, the imprints 
are almost always associated upon the same surface. I have 
a slab in my cabinet, nine feet long by four wide, which con- 
tains sixty fine imprints arranged in nine or ten independent 
lines, and although the size of feet and length of stride differs 
thaterially, I can detect no other certain specific characters. 
In the collection of Dr. A. Binney, of Boston, is a beautiful 
example of this class derived from Turner’s Falls. ` 
It may be inferred that Pl. X XIII. fig. 3, is an individual of 
this group, but it is not so. It certainly presents à similitude 
to the eye, but the nails are very short. It is a graceful, little 
footstep, and belongs to'a light, tall bird, and constitutes ? 
perfect contrast to the preceding example. This is inferred 
from its immense stride as compared with its diminutive foot, 
and from the fact that the feet fall in nearly a direct line. 
Fig. 1, in the diagram, shows these relations. The stride 1$ 
twenty-one inches, or one-half longer than Fig. 3- i 
seen too many instances of this variety to suppose that this 18 
a running gait ; besides, there is always a slipping of the foot 
when the bird runs, the impress often being several inches 
advanced from the spot where the foot first strikes the gr ound. 
This beautiful species is found only at Turner’s Falls, and i$ 
very rare. s proe 
- In Pl. XXIII. fig. 2, we see the representative of a Tace 
large birds, some individuals of which attained an enormous 
.. Size. They were elevated upon long legs, as the stride indicates, 
_ Which, in this instance, was twenty-eight inches, and it 1$ pens 
arly four feet. Fig. 2, in the diagram, shows the relations. 
