more elongated. The obturator-notch is sometimes, as in many tumblers,
less developed than in the rock-pigeon. The ridges on the ilium are
very prominent in most runts.

In the bones of the extremities I could detect no difference, except in
their proportional lengths; for instance, the metatarsus in a pouter
was 1.65 inch, and in a short-faced tumbler only .95 in length; and
this is a greater difference than would naturally follow from their
differently-sized bodies; but long legs in the pouter, and small feet
in the tumbler, are selected points. In some pouters the _scapula_ is
rather straighter, and in some {167} tumblers it is straighter, with
the apex less elongated, than in the rock-pigeon: in the woodcut, fig.
28, the scapulae of the rock-pigeon (A), and of a short-faced tumbler
(B), are given. The processes at the summit of the _coracoid_, which
receive the extremities of the furcula, form a more perfect cavity in
some tumblers than in the rock-pigeon: in pouters these processes are
larger and differently shaped, and the exterior angle of the extremity
of the coracoid, which is articulated to the sternum, is squarer.

[Illustration: Fig. 29.--Furculae, of natural size. A. Short-faced
Tumbler B and C. Fantails. D. Pouter.]

The two arms of the _furcula_ in pouters diverge less, proportionally
to their length, than in the rock-pigeon; and the symphysis is more
solid and pointed. In fantails the degree of divergence of the two arms
varies in a remarkable mariner. In fig. 29, B and C represent the
furculae of two fantails; and it will be seen that the divergence in B
is rather less even than in the furcula of the short-faced, small-sized
tumbler (A); whereas the divergence in C equals that in a rock-pigeon,
or in the pouter (D), though the latter is a much larger bird. The
extremities of the furcula, where articulated to the coracoids, vary
considerably in outline.

In the _sternum_ the differences in form are slight, except in the size
and outline of the perforations, which, both in the larger and lesser
sized breeds, are sometimes small. These perforations, also, are
sometimes either nearly circular, or elongated, as is often the case
with carriers. The posterior perforations occasionally are not
complete, being left open posteriorly. The marginal apophyses forming
the