PHYLOGENY OF THE PALZOGNATHA AND NEOGNATHA. 
B. VERTEBR# (not including Crypturi) }. 
2 
1 
All the pre-synsacral yertebre are heteroccelous and free; all the synsacral vertebre develop 
high neural spines ; intercentra are wanting. 
A. Hyperapophyses of axis well developed; cervical vertebre short; cervical 
diapophysial lamelle large and conspicuous; at least one lumbo-sacral 
vertebra; sacro-caudal (post-sacral) vertebre well ossified. 
a. Hyperapophyses of atlas moderate; neural spine of axis rather high; 
a. 
hyperapophyses of axis well developed; cervical vertebre rather short ; 
neural spines of cervical vertebrz well developed and greatly excavated 
postaxially ; no neural spines laterally bifurcating ; catapophyses com- 
mence at about the sixth vertebra, and do not form a rmg; hypapophyses 
well developed, not much produced postaxiad; diapophysial lamella 
extending towards postzygapophysis, large and conspicuous; cervical 
ribs moderately long and styliform ;, thoracic and lumbar neural spines 
not much axially extended, and not subequal in height; post-sacral 
vertebre raised in part, more or less, above ventral margins of acetabula ; 
sacral vertebrae not plainly distinct from post-sacrals ; sacral and post- 
sacral neural spines laterally expanded and separating the post-acetabular 
ilium ; caudal vertebre eight or nine; pygostyle cylindrical. 
Total number of vertebre fifty-four; cervical vertebra seventeen or 
eighteen ; vertebre with ribs nine; post-sacral vertebre nine or ten ; 
pre-axial articular surface of atlas moderately notched dorsally ; hypa- 
pophysis of axis much elongated; hypapophyses developed from the 
eighteenth or nineteenth to the twenty-third vertebra; a conspicuous 
fossa on each side of the pre-axial part of the neural spines of dorsal 
vertebrze ; post-sacral vertebrae raised raed dorsad of ventral 
margins of acetabula 
b’. Total number of vertebre from fifty- Hive to fifty- nine ; eemeal Sr eebes 
fifteen or fourteen ; vertebre with (free) ribs eleven or twelve; sacro- 
caudal (post-sacral) vertebre eight or nine; pre-axial articular surface 
of atlas moderate, may become a foramen; hypapophysis of axis 
extremely long; hypapophyses developed from eighteenth to twentieth 
vertebra ; fossze beside pre-axial part of neural spines very small ; sacro- 
caudal (post-sacral) vertebra raised scarcely at all dorsad of acetabula . 
b. Hyperapophyses of atlas large ; neural spine of axis lofty ; hyperapophysis 
of axis moderate or extremely large; cervical vertebrz short ; neural 
spines of cervical vertebra generally more or less well developed ; cata- 
Dromeus. 
Casuarius. 
resembles D. irroratus. 
species. 
In the conspicuous development of the cerebral dome it differs trom both existing 
I would remark here that the specific characters attributed to D. irroratus are based upon an examination 
of a single unnamed skull in the British Museum Collection ; but these appeared to me to be sufficiently 
marked to justify my determination of this skull as of D. irroratus. 
‘ This Key is compiled, with modifications, from Mivart’s memoir. 
2P 
2, 
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