33 
process (7), with its sustaining buttress formed by the back part of the mesometa- 
tarsal; into the upper part of this concavity opens the canal (2) between the ento- and 
meso-metatarsals. The smaller interosseous canal (m), between the meso- and ecto- 
metatarsals, opens into the shallower depression (fig. 1, w) external to the calcaneal 
prominence. This depression is bounded externally by the ectogastrocnemial ridge (2), 
which describes a slight curve, convex backward, as it descends to terminate on the 
ectotrochlear ridge (fig. 2, z). From the back part of the mesometarsal (fig. 2, 7”), 
which projects in a subtriangular form, a narrow (postinterosseal) ridge (ib. y) is con- 
tinued, which descends for some way outside of and parallel with the one continued 
down from 7’; but at the beginning of the trochlear expanse it bends outward, and 
terminates in the tuberosity, or thicker ridge! (z), at the outer and hinder part of the 
ectotrochlea (iv). The entogastrocnemial ridge’ (g) terminates at the upper border of 
the “hallucial surface” (1), The mid ridge or hind angle of the mesometatarsal (111) 
runs down along the outer side of the hallucial surface, almost subsiding, but seeming 
to be continued by a strong oblique ridge (fig. 2, «), lost upon the back part of 
the neck of the entotrochlea (11). A tendinal groove (fig. 2, n) extends from the 
upper and outer part of the oblique ridge to or near to the interspace between the 
ento- and meso-trochler. 
The post-trochlear depression (fig. 2, y), bounded by the oblique ridges (« & z), and 
by the backwardly produced ento- (11) and ecto- (Iv) trochlew, is shallow, but well 
defined. 
The entotrochlea (it) is convex anteriorly, canaliculate behind, and chiefly through 
the production of its inner and hinder part. ‘The ectotrochlea (rv) is less concave, almost 
flat, transversely, behind, its outer and hinder border being less produced and more 
rounded off. The depression (7*) on the outer side of the ectotrochlea is rather deeper 
and better defined than that on the inner side of the entotrochlea (Pl. ITI. fig. 4, 11). 
The outer trochlea does not extend so low down as the inner one; and the interspace 
between it and the mid trochlea reaches higher up, especially behind, so that the outer 
part of the neck of the mid trochlea (fig. 2, 11) is the longest. The mid groove of that 
trochlea runs from the fore to the hind part, and is deepest anteriorly (fig. 3, 111). 
As compared with Didus, the entocondylar cayity (a) is deeper, and the margin 
better defined, in Pezophaps (figs. 12,13). The intercondylar tubercle is higher and 
less obtuse in Pezophaps, The hind border of the entocondylar expansion extends 
further in Pezophaps than in Didus before passing to the inner side of the entocalcaneal 
process (ib. ”), ‘The upper border of the entocalcaneal process is thinner in Pezo- 
! This is mutilated in the specimen figured in Trans. Zool. Soc. vol. iv. pl. 55, fig. 6. 
t The insertions of “ the strong ligamentous aponeurosis” formed by the confluence of the tendons of the 
gastrocnemius internus and gastrocnemius externus (p. 58, text) are represented in pl. 11, fig, 2, x, and in fig. 1; 
also in pl. 14. n***, in Apteryx australis, The ridges termed “ eastrocnemial” mark the lines of insertion of 
this strong aponeurotic sheath for the tendons of the deeper-seated muscles, chiefly flexors of the toes. 
