50 MR. ST. GEORGE MIVART ON THE 
vertebra; hypapophyses not largely developed relatively ; diapophysial lamella extremely 
large and conspicuous, developing conspicuous postaxially extending processes ; cervical 
styliform ribs small ; dorsal and dorso-lumbar neural spines exceedingly extended axially 
and subequal in height; spine of last cervical greatly more extended dorso-ventrally 
than that of its preaxial predecessor; sacral vertebre plainly distinct from sacro-caudal ; 
sacro-caudal vertebre bent much ventrad of ilia; caudal vertebre seven or nine; pygo- 
style conical; supratrochanteric process absent; ilia diverging ventrad at a very obtuse 
angle; interobturator processes absent or rudimentary; pubis exceedingly slender; 
ischium extending as much or slightly more postaxiad than ilium; pubis extending 
postaxiad slightly more than ischium ; ilio-pectineal processes very largely developed ; 
skeleton of tail broadened out medianly ; sacrum narrow; vertebral ribs exceedingly 
wide, far wider relatively than in any other genus of Struthionide ; uncinate processes 
seven, and very large; fosse beside lumbo-sacral vertebra, linear; preaxial margin of 
sternum gently concave, no sharp or deep median notch, pleurosteon with four articular 
surfaces for sternal ribs. 
CHARACTERS OF DIVORNIS. 
Hypapophysis of axis probably large; hyperapophyses of axis moderate; neural 
spines of cervical vertebrae well developed and deeply excavated postaxially ; neural 
spines of fourth, fifth, sixth, and seventh cervical vertebre bifurcating laterally ; cata- 
pophyses commencing at the fourth vertebra; hypapophyses commence at fifteenth 
(last cervical) vertebra; diapophysial lamella extending towards postzygapophysis, large 
and conspicuous ; cervical ribs probably moderately long and rather styliform ; dorsal 
and dorso-lumbar neural spines not much axially extended, and probably not subequal 
in height ; sacro-caudal vertebre not bent ventrad of ilia; spine of last cervical not 
greatly more extended dorso-ventrally than that of its preaxial predecessor ; sacral and 
sacro-caudal vertebra not plainly distinct; ilia not diverging ventrad at a very obtuse 
angle ; interobturator processes present and approximating ; ischium and pubis unite 
slightly at their distal ends; ilium more postaxially extended than either ischium or 
pubis ; ilio-pectineal processes very little developed ; pubis not extremely slender ; sacrum 
broad; supratrochanteric processes inconspicuous; ribs very narrow and straight; no 
uncinate processes (?); fossee beside lumbo-sacral vertebrae, large and subcrescentic ; 
preaxial margin of sternum straight and rounded, only two or three costal articular 
surfaces in each pleurosteon, which is very small outside of and postaxial to each 
costal angle. 
