48 Jin. ST. GEOEGE MIVAET ON THE 



well developed and greatly excavated postaxially ; no neural spines laterally bifurcating ; 

 catapophyses commence at about the sixth vertebra ; they do not form a ring ; hypa- 

 pophyses well developed, but not much produced postaxiad ; diapophysial lamella ex- 

 tending towards postzygapophysis, large and conspicuous ; cervical ribs moderately long 

 and styliform ; dorsal and dorso-lumbar neural spines not much axially extended, and 

 not subequal in height ; sacro-caudal vertebrae raised in part more or less above ventral 

 margins of acetabula ; sacral vertebree not plainly distinct from sacro-caudal vertebrse ; 

 caudal vertebrae eight or nine ; pygostyle cylindroidal ; ilium and ischium not united, but 

 not greatly diverging ; supratrochanteric process sharp and conspicuous, placed post- 

 axiad of the antitrochanteric process ; postaxial part of ilium very convex ; interobtu- 

 rator processes meet or closely approximate ; ischium extending more or less postaxiad 

 of pubis ; ischium equals or sliglitly exceeds ilium in postaxial extension ; ischium not 

 diverging much ventrad of ilium; pubis extending postaxiad as much as or less than 

 ilium ; ilio-pectineal processes moderate ; .ischium not broad ; pubis not very slender ; 

 skeleton of tail not broadening out medianly ; sacrum narrow ; curvature of ribs much 

 as in Struthio ; uncinate processes not very long ; sternum longer than broad ; coracoid- 

 grooves approximated and tolerably large, lips of each groove very unequal ; no long 

 xiphoid processes. 



CHAEACTERS OF DBOM^US. 

 Total number of vertebrae fif ty-f^ur ; cervical vertebrae seventeen or eighteen ; vertebrae 

 with ribs nine ; sacro-caudal vertebrae nine or ten ; preaxial articular surface of atlas 

 moderately notched dorsally ; hypapophysis of axis much elongated ; hypapophyses 

 developed from the eighteenth or nineteenth to the twenty-third vertebra ; a conspicu- 

 ous fossa on each side of preaxial part of neural spines of dorsal vertebrae ; sacro-caudal 

 vertebrae raised decidedly dorsad of ventral margins of acetabula ; interobturator pro- 

 cesses meet; ischium not joining distal end of pubis; ischium extends very slightly 

 postaxiad to ilium ; pubis extends postaxiad less than ischium, and least of all the pelvic 

 elements ; acetabula so far ventrad of vertebral column that the ventral third of both 

 can be seen through when opposite ; ribs moderately wide ; uncinate processes two or 

 three; sternum not much longer than broad, preaxial margin with a median promi- 

 nence, this prominence very slightly notched medianly, no postaxial median pro- 

 minence; costal angles very long and singular, bent inwards; three or four costal 

 articular surfaces in each pleurosteon. 



CHARACTERS OF CASUASIUS. 

 Total number of vertebrae from fifty-five to fifty-nine ; cervical vertebras fifteen or 

 fourteen ; vertebrae with ribs eleven or twelve ; sacro-caudal vertebrae eight or nine ; 

 preaxial articular surface of atlas moderate, may become a foramen ; hypapophysis of 



