120 PROFESSOR OWEN ON THE GENUS DINORNIS. 
EXPLANATION OF THE PLATES. 
PLATE VII. 
Fig. 1. Sternum, inner or back view, of Palapterya elephantopus: nat. size. 
2. Costal border and lateral process of the same: nat. size. 
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PLATE VIII. 
Fig. 1. Sternum, outer or front view, of Dinornis rheides: nat. size. 
Fig. 2. Profile view, right side, of the same sternum. 
PLATE IX. 
. Sternum, inner or back view, nat. size, of Dinornis rheides. 
Fig. 4. Anterior or upper border of Dinornis rheides: nat. size. 
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Supplementary remarks on the Sternum in Dinornis. 
In a collection of bones transmitted by Dr. Haast to the Royal College of Surgeons, 
and which have been recently submitted, by his request, to my examination, there was 
a lot marked “no. 16, fragments of sternum of Dinornis crassus,” and associated with a 
portion of the skeleton ascribed to the same species. ‘This lot contained portions of 
sternums of three or more species of Dinornis, and probably included all the parts of 
that rare bone which had been obtained in this collection from the swamp at 
Glenmark. 
One of the fragments (no. 1), including the left anterior angle wanting the costal 
process, affords the means of comparing the anterior and costal borders with the 
sternum of Dinornis rheides. ‘The costal border shows a proportion of extent from 
without inward double that in D. rheides; it is of a more definite triangular form, with 
the base forming the inner or upper border of the tract, and the apex obtuse; it is 
traversed by two obligue continuous ridges for the attachment of the sternal ribs, the 
second of nearly equal extent with the first, which is not divided as in D. rheides and 
the Ostrich. ‘The anterior border is bent upward or inward like that in D. rheides, but 
terminates in a much thicker margin than in D. rheides; the convex bend inclines 
towards the costal border, is not so abruptly continued into it as in D. rheides: there is 
no definite pneumatic depression; the pneumatic foramina extend over a greater pro- 
portion of the fore part of the upper or inner concavity. The whole bone, so far as 
preserved in this fragment, is thicker than the corresponding part of D. rhetdes, and 
may well, therefore, have formed part of the sternum of the more robust species of 
Dinornis to which it is ascribed by Dr. Haast. 
A second corresponding fragment of a sternum (no, 2), in which the costal process is 
preserved, has a costal border resembling in shape that in D. rheides; but both articular 
