233 
atlas is convex, a little hollowed above to receive the odontoid process: the lateral 
‘ vertebral’ canals are defined each by a slender vertical bar of bone. The under surface 
is produced into a pair of short tubercles at its hind margin and at its front margin ; 
and they project respectively backwards and forwards, not downwards as hypapophyses. 
The deep anterior cup, which receives the single occipital condyle, is notched at the 
middle of its upper part. The neural arch expands beyond the breadth of the centrum, 
and developes only the posterior pair of zygapophyses. 
The pelvis of the Dinornis elephantopus (Pl. LX. S, 63, 64) is one foot nine inches in 
length, contrasting extraordinarily with the size of the skull. 
Six of the anterior sacral vertebrae have parapophyses with the ribs confluent with 
them, save in the first: beyond the second vertebra the ribs simply abut against the 
ilium, with which they are confluent. 
The ischium, 63, and pubis, 64, which coalesce with the ilium to form the acetabu- 
lum, do not again unite with each other: the notch at the under and fore part of the 
ischium opens into the long interspace between the two posteriorly extended bones. 
This part of the pubis, 64, is straight and styliform, 8} inches in length; slightly 
expanded, to a breadth of 14 lines, near the end ; flattened externally, convex internally, 
so as to offer a subtrihedral transverse section. The ischium, 63, with an upper and 
lower notch, having smooth and thick rounded borders, near the acetabulum, expands 
gradually, and is flattened, into a plate of about three inches of vertical depth, with a 
truncate termination. 
Nine caudal vertebre, of a transversely subquadrate form, with a contracted neural 
canal, surmounted by a low transversely extended arch supporting a pair of tubercles, 
represent the basis of the short tail of the Dinornis. 
The last of these vertebrae is as small and simple as in other large birds devoid of the 
power of flight; showing nothing of that characteristic modification of the terminal 
coalesced coccygeals in birds of flight, for the support of the rectrices, or steering quill- 
feathers of the tail. 
The cranium, Pl. LIX., is six inches eight lines in length ; three inches nine lines 
across the broadest part, behind the orbits. The post-orbital process is broad, com- 
pressed, and descends nearly to the zygomatic arch. The upper mandible is slightly 
deflected, conical, obtusely pointed, with the external nostrils terminating at the distance 
of about an inch from the apex of the premaxillary. The upper part of the median 
nasal process of this bone, together with the nasals, has been broken away. The 
minor characters of the cranium and of the lower mandible accord generically with 
those of the Dinornis, described in pp. 116 and 206. ‘The chief peculiarity of the 
skull in the present species is its small size, as contrasted with the pelvis and hind 
limbs. 
The keel-less sternum, P!. LXI., in its shortness, breadth, and subquadrate form ; in 
the two wide and deep posterior notches; in the unusually small and shallow coracoid 
2a2 
