245 
shaft, about one-third from the distal end of the bone, and bends 
outwards, forwards and downwards, increasing in breadth and con- 
vexity, and forming the outer boundary of the characteristic broad 
rotular surface. The convex fore-part of the inner condyle forming 
the inner boundary of that surface is shorter, and rises more abruptly. 
The deep oval fossa, above the vertical broad groove for the fibula, 
behind the outer condyle, is well marked. The orifice of the medul- 
lary artery is at the middle of the back part of the shaft of the femur 
in two of the specimens. 
With regard to the metatarsus of the Dinornis struthioides, the 
same satisfactory confirmation of the species has been received, as in 
the case of the femur, by the addition of three specimens repeating 
the characters of the original bone described at p. 240, and figured 
in pl. 27. fig. 2. of my memoir of 1843. One of these specimens, 
kindly sent to me by J. R. Gowen, Esq., F.G.S., Sec. H.S., was 
discovered in the tertiary deposits at Waikawaite, Middle Island of 
New Zealand, and has the two extremities more entire than in the 
original specimen figured. The middle of the distal trochlea is im- 
pressed by a shallow groove running its whole length, and becoming 
more shallow as it approaches the contracted back part of the trochlea, 
which terminates abruptly, projecting beyond the level of the back 
part of the distal end of the bone. 
A second of the additional specimens of the metatarsus of the 
Din. struthioides was obtained by the Rev. Wm. Cotton, M.A., at 
Tarawaite, in the North Island of New Zealand: a third specimen 
was discovered by Governor Sir George Grey, in a cave in the district 
which lies between the river Waikate and Mount Tongariro, in the 
North Island. 
From the same cave Sir George Grey likewise obtained and very 
liberally transmitted to me, with a most valuable collection of other 
bones of Dinornis and Palapteryx, an entire tibia agreeing with the 
portion of shaft, which, from the dimensions given at vol. ii. p. 329, 
I was induced to refer to the Dinornis struthioides, differing in its 
size and proportions from all the tibiz previously described and 
referred to other species, but presenting similar relations of size to 
the femur and metatarsus of the Din.. struthioides, which the pre- 
viously described tibize have presented to the other bones of the leg 
of the respective species to which those tibize have been referred. 
I conclude, therefore, that in the tibia transmitted with the meta- 
tarsus of the Din. struthioides by Sir George Grey, I possess the 
bone, which I have been so long desirous to obtain in order to com- 
plete the leg of the Din. struthioides. Like the metatarsus above- 
cited, it is from the left side, and they appear to have belonged to the 
same individual bird. 
in. lin. 
Theilengthiofithis bone fis}: :4 248.90) .. oetee 22 0 
The breadth of the proximal extremity ........ 5 6 
The breadth of the distal extremity .......... 3 2 
The circumference of the middle of the shaft .. 5 0 
The fibular ridge extends down .............. 10 0 
