85 = 247 in anginal 
same proportion to the bone of sixteen inches in length, as this does to that of thirty- 
five inches. The tibia of eight inches and two-thirds in length, ¢ 11, has its articular ex- 
tremities as completely ossified and confluent with the shaft, and its proximal and fibular 
ridges as strongly developed, as in the larger tibie. The shape of its proximal articu- 
lation (Pl. XXVI. fig. 6.) differs more from that of #4 than this does from that of ¢ 2 ; 
the tibial half is broader from behind forwards than transversely ; the anterior ridge at 
the proximal end is nearer the middle of the bone than in ¢ 4, @ fortiori, nearer than in 
t 2; the inner side of the bone is more rounded or less angular, especially at the proxi- 
mal half of the shaft ; the transverse diameter of the shaft is proportionally less than the 
antero-posterior one ; the posterior notch between the distal condyles is deeper, and the 
inner condyle (Pl, XXV. fig. 6.7) is more compressed laterally, and is produced further 
backwards, There is no tarso-metatarsal to match the tibia ¢ 11: this bone unequivo- 
cally establishes a fourth species of cursorial bird, which, from the agreement of the bone 
in its general characters with the tibia of the larger species, most probably belonged to 
the same genus, Dinornis, but did not surpass in size the Great Bustard (Otis tarda), 
I propose, therefore, to name the species to which it belonged, Dinornis otidiformis. _ 
The distal articular surface of the longest tibia, ¢ 1, fits the proximal joint of the 
longest tarso-metatarsal, m1. ‘There is no tarso-metatarsal bone corresponding with 
the tibia 2. This bone agrees more closely in its proportions and configuration with 
t 1 than with ¢ 4: from the latter it is evidently specifically distinct, but less clearly so 
from the largest tibia. Yet the difference of size is sufficiently striking; too great, 
without other evidence, to justify the assumption that it depends on difference of sex ; 
and the mature characters of the shorter bone ¢ 2 militate against the supposition of 
a difference of age. At the proximal extremity the external ridge is relatively less 
produced but thicker and stronger in ¢ 2, and the internal condyle or boundary is 
broader in ¢ 2. In the next section we shall find that there are different-sized femora 
with equally mature characters which correspond respectively with ¢1 and #2. These 
considerations induce me to regard ¢ 2 as indicative of a distinct species of Dinornis 
which must have stood about nine feet in height, and may be provisionally called 
‘Dinornis ingens.’ 
The smallest tarso-metatarsal bones in the present collection, m 4, m 5, m 6, corre- 
spond precisely with the tibie ¢ 3, ¢4,¢8,¢9. The proportions of the shaft ¢ 7 cor- 
respond with those of the intermediate metatarsal, m 3. 
Femora. (Pl, XXI. XXII. XXIII. XXTV.) 
The femur is remarkable for its great strength and the expansion of its extremities : 
the smallest diameter of the shaft is one-seventh the length of the entire bone. The 
trochanter @ is unusually broad, thick and elevated; the distal extremity is still more 
remarkable for its great size, and especially for the breadth of its rotular concavity d. 
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