50 ME. ST. GEOEGB MIVAKT 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 la.st cervical greatly more extended dorso-ventrally 

 than that of its preaxial predecessor ; sacral vertebrae plainly distinct from sacro-caudal ; 

 sacro-caudal vertebrae bent much ventrad of ilia ; caudal vertebrae 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 Struthionidae ; uncinate processes 

 seven, and very large ; fossae beside lumbo-sacral vertebrae, linear ; preaxial margin of 

 sternum gently concave, no sharp or deep median notch, pleurosteon with four articular 

 surfaces for sternal ribs. 



CHARACTERS OF BINOBNIS. 



Hypapophysis of axis probably large; hyperapophyses of axis moderate; neural 

 spines of cervical vertebrae well developed and deeply excavated postaxially ; neural 

 spines of foui'th, fifth, sixth, and seventh cervical vertebrae 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 vertebr£e 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 vertebrae not plaiidy 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 (?) ; fossae beside lumbo-sacral vertebrae, large and subcresccntic ; 

 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. 



