26 MR. ST. GEOEGE MIVAET ON THE 



extremely long, and project inwards and postaxially in a way not to be found in Struthio 

 or Ehea. The inner surface of the sternum is not so concave in either direction as in 

 the last-mentioned genus. 



VERTEBRAL PARTS AND PROCESSES. 



These portions of the skeleton generally resemble those of Bhea, except in the fol- 

 lowing points: — 



The centra never abort ; nor do the neural lamince, as far as can be determined ; but 

 it is possible that they may do so in some part of the pelvis. 



The neural spines of the cervical vertebrae are better-developed, but are not laterally 

 bifid, though they are nearly so in some caudal vertebrae. 



It is doubtful whether diajpophyses are ever absent, save in the last presacral 

 vertebrae. 



Ryperapophyses. The interzygapophysial canals form conspicuous structures. 



The cervical styloid rihs are well developed, and resemble those of Struthio and not 

 those of Rhea. 



Catapophyses are developed from the sixth to the seventeenth vertebra inclusive. 



The hypapophysis is paired in the first cervico-dorsal vertebra. 



The vertebrce are not raised above the acetabula. 



The vertebral ribs are stouter than in Ehea, but with the same twist. 



The uncinate processes do not seem to be ever more than two in number. 



THE AXIAL SKELETON OF CASUABIUS. 



The axial skeleton of Casuarius so much resembles that of Dromceus, that a much less 

 detailed notice of the former than of the latter is alone needed. 



In Casuarius there are fourteen, fifteen, or sixteen cervical and four or three cervico- 

 dorsal vertebrae; there are five dorsal and two or three dorso-lumbar vertebrae; to 

 these succeed nine or ten lumbar and three sacral vertebrae, followed by nine, ten, or 

 eleven sacro-caudal and eight or nine caudal vertebrae. Thus there may be from 

 fifty-five to fifty-nine vertebrae in all ; and of these as many as from twenty-five to 

 twenty-seven belong to the first four categories, thus diflering from Rhea and agreeing 

 with Struthio and Dromceus. It also agrees with the last-named genus in the number 

 of its caudal vertebrae. 



