46 ME. ST. GEOEGE MIVAET ON THE 



and inconspicuous ; a conspicuous fossa on either side of preaxial part of neural spines 

 either of the cervical or else of the dorsal vertebrae ; sacral vertebrae plainly distinct 

 from sacro-caudal vertebrae ; ilium and ischium united or not ; postaxial part of ilium 

 not bent much ventrad ; interobturator processes meeting ; ischium joins pubis ; either 

 an ischiatic or a pubic symphysis ; ischium not diverging much ventrad from ilium ; 

 marked ilio-pectineal processes ; ischium not broad; pubis not very slender; skeleton 

 of tail not broadening out medianly ; sacrum narrow ; distal articular surfaces of sternal 

 ribs each in two parts ; coracoid-grooves large ; lips of each coracoid-groove subequal ; 

 no median sternal preaxial process. 



CHARACTERS OF STRUTHIO. 



Total number of vertebrae fifty-six ; cervical vertebra seventeen ; vertebrae with ribs 

 ten ; no lumbo-sacral vertebrae ; sacro-caudal vertebrae eight ; preaxial articular surface 

 of atlas with a large dorsal notch ; hyperapophyses of atlas moderate ; hypapophysis of 

 axis rather small ; neural spine of axis moderate ; neural spines of cervical vertebra; 

 small but not obsolete; no neural spines bifurcating laterally; no neural spines 

 aborted ; hypapophysis developed from the eighteenth (first cervico-dorsal) to the 

 twenty-first (first dorsal) vertebra; hypapophyses but little produced preaxially; a 

 conspicuous fossa on each side of preaxial part of neural spines of dorsal vertebrae, 

 but not of cervical ; cervical ribs long and styliform ; dorsal and dorso-lumbar neural 

 spines but little axially extended, but considerably extended dorso-ventrally and not 

 subequal in height; sacro-caudal vertebrae not at all raised dorsad of acetabula, but 

 rather depressed ventrad ; sacro-caudal vertebrae perfectly ossified ; sacral vertebrae 

 plainly distinct from sacro-caudal vertebrae; no lumbo-sacral vertebrae; caudal ver- 

 tebrae ten ; pygostyle a laterally compressed plate ; ilium and ischium not united ; 

 supratrochanteric fossa not sharp and conspicuous, and placed somewhat postaxiad of 

 antitrochanteric process ; ischium joins pubis, but not at distal end of latter ; no 

 ischiatic symphysis ; ischium extends a little postaxiad of ilium ; pubis extends post- 

 axially considerably beyond ischium, as well as ilium ; a pubic symphysis ; acetabula 

 not ventrad of vertebral column, so that the acetabula cannot at all be seen through 

 when opposite each other ; ribs moderately wide, curvature as described ; complete ribs 

 five ; uncinate processes three, their distal ends bent at nearly a right angle to their 

 proximal parts ; sternum about as long as broad ; coracoid-grooves approximated, pre- 

 axial margin convex, but with no prominent median process, costal angles moderate, 

 five costal articular surfaces in each pleurosteon. 



CHARACTERS OF BHEA. 



Total number of vertebrae forty-nine ; cervical vertebrae fourteen ; vertebrae with ribs 

 nine ; sacro-caudal vertebrae nine ; three or four lumbo-sacral vertebrae ; preaxial articular 



