or 
PROFESSOR OWEN ON THE GENUS DINORNIS. 15 
The parial hypapophyses (‘ catapophyses,’ Mivart) commence at the fifth cervical as 
low tubercular ridges. They come nearest to each other at the fourteenth, but do not, 
in Dinornis, circumscribe a hemal canal in any vertebra’. In the fifteenth cervical the 
parials combine to form a single medial hypapophysis near the middle of the length of 
the under surface. 
In one skeleton of D. elephantopus this coalescence takes place at a sixteenth cervical, 
the antecedent series having one more vertebra than in the skeleton of D. maatmus 
here described. 
The pleurapophysial plate is sculptured outwardly by longitudinal ridges and 
channels; the riblet loses relative length after the sixth or seventh cervical. The pre- 
and post-axial articular surfaces retain their essential character throughout, being con- 
cayo-convex in opposite directions; the fore surface is always superior in breadth, and 
this dimension, though less in the hind surface, is greater than the vertical diameter. 
A larger proportion of the neural surface of the fore end of the centrum is uncovered 
by the neural arch after the third and fourth cervicals. 
From the neck series are selected vertebra for views corresponding to some of those 
given by Mivart of the Ostrich, which best illustrate the modifications of such vertebrae 
in the larger flightless bird. 
SIXTH VERTEBRA (4 nat. size). 
Fig. 14. 
aZ hy aZ 

Fig. 14, hamal (ventral) aspect. 
The hypapophyses in the sixth cervical (fig. 14, hy) are oblong, smoothly obtuse 
tuberosities. The exterior of the parapophysial part (p) of the pleurapophysial plate 
‘ Comp. with this modification the cervical vertebra in the Flamingo (‘ Anat. of Vertebrates,’ vol. i. p. 29, 
fig. 20, h). 
VOL. X.—PART 111. No. 4.—October 1st, 1877. Z 
