201 
TABLE ITI. 
Showing dimensions of tibio-tarsus of Genyornis newtoni in 
comparison with those of the tibio-tarsi of Dinornis elephantopus, 
Owen (Pachyornis elephantopus, Lydekker), and pyornis maxi- 
MUS. 
Breadth of Basalt ot Circumfer 
— Length. proximal ence of 
2 | distal end. ve 
end. middle. 
Inches, Mm. Inches. | Mm. | Inches.) Mm. | Inches. | 
Genyornis newtoni... | 23% | 602 | 72 | 193 | 4 | 101 | 62 | 
Dinornis elephantopus, | 
Owen = 241608 P72 AST | 42" 105s 65 | 
Aipyornis maximus, | | | 
Geoffroy | 2a OL0 | tae ToD) | eo tga lt Gt 
| \ \ 
Mm. | 
land 
d 
162 
| 158 
The Genyornis tibia belongs to one of the large pair of femora 
of the preceding table. The measurements of that of Dinornis 
elephantopus are from Owen’s tables and those of Mpyornis from 
Milne Edwards’s work previously quoted, p. 93. 
Fibula.—(Pl. iv., figs. 8, 9.) This bone presents the usual 
laterally sub-compressed and backwardly produced head. The 
superior articular surface—that upon which the femur plays—is an 
elongated oval, slightly concave antero-posteriorly, and nearly flat 
transversely. It is not coextensive with the whole upper surface 
of the head, but leaves a non-articular area in front which slopes 
more abruptly downward and forward. Lying obliquely athwart 
the internal surface of the head is an elongated depression or 
groove (Fig. 9, A) which is directed towards the edge of the articu- 
lar surface of the tibio-tarsus, though the absence of a distinct 
corresponding facet on that bone has been mentioned. Externally 
the head is also slightly concave in antero-posterior direction. 
The upper part of the shaft is sub-compressed in the same 
direction as the head, but soon becomes sub-circular in section. 
A little below the head on the anterior surface is a small 
tuberosity. With the commencement of the lower articular sur- 
face for the tibio-tarsus, about 5 inches below the summit, the shaft 
increases in size, becoming at the same time sub-triangular in 
section, the outer surface being convex, the postero-internal 
nearly flat, and the anterior somewhat concave. 
The lower articular surface for the tibio-tarsus (Fig, 9, B) is 
an elongated rough area about three inches in length, which at 
its upper part is provided at the expense of the internal angle 
of the, in this situation, trilateral shaft, but as it descends it 
encroaches more and more upon that surface of the shaft de- 
