390 
ness. ‘The ischium sends upward a short and thick acetabular process above the fore end, 
which expands to contribute to the articular cup for the femur. The lower part of this 
expansion has coalesced with the acetabular end of the pubis. The inferior process of 
the ischium, marking off the anterior portion of the ‘ obturator vacuity’ for the passage 
of a tendon, is feebly indicated: behind this the ischium is laterally compressed and 
vertically expanded; the pubis retains its styliform character to the hinder end. This, 
in the adult bird, coalesces with that of the ischium; but the ischium does not coalesce 
with the hinder end of the ilium, as it does in the Emu (Dromeus). The ischiadic 
notch remains open, as in Apterya (comp. Plate XOVI. fig. 1, with Plate VIII.), 
The collected bones of the same immature Dinornis robustus included the left moiety 
of the sternum, to the figure of which, in Plate CXV. fig. 8, I have added in outline 
the entire bone as indicated at this period, I infer that, as in the Apteryx (p. 69), the 
sternum is ossified from two centres, forming a pair, from which, as they coalesce at 
the middle line, ossification extends into the postmedial portion, simulating a ‘ xiphoid 
cartilage.’ The ossified half of the sternum of the chick of D. robustus showed the 
costal process, the costal border, and the lateral process. The scapula and coracoid 
of the same chick had coalesced (ib. fig. 7; the longer scapular portion is inadver- 
tently turned downward); and it is not devoid of significance to note that the pro- 
portion of this arch to the sternum is greater in the chick or embryo than in the adult 
bird. It would seem that the development of the support of the wing-bone was 
arrested. 
The skeleton of Dinornis robustus, as restored in Plate XCVI. ., shows a height of 
8 feet 6 inches; but the trunk is raised, and the neck outstretched somewhat beyond the 
pose of easy station. In such a position as that of the skeleton of Dinornis rheides 
(Plate CIX.) the D. robustus would barely reach 8 feet in height. 
DESCRIPTION OF THE PLATE. 
PLATE XCVI. 
1. Side view of the skeleton of Dinornis robustus. 
2, Front border of sternum, with two sternal ribs of the left side. 
Fig. 3. Under or outer surface of the sternum, with two right and one left sternal ribs, 
4, Under or inner surface of the pelvis. 
(All these figures are reduced to the scale of feet and inches in the margin.) 
