44 ME. ST. GBOEGE MIVAET ON THE 



THE PELVIS. 



When viewed preaxially, the pelvis differs from that of Apteryx, and agrees with the 

 same part in the other genera, in that the ilia form a less obtuse angle. It, however, 

 agrees with that of Apteryx in the great extent to which the ischia and pubes come into 

 view. 



Viewed laterally, the close resemblance of this bone in the position and proportions 

 of the ischium and pubis is striking, as also is the relation of the acetabula to the spinal 

 column ; for, as in Apteryx, a great part of the aperture of the opposite acetabulum can 

 be seen through the nearer one. The ilia are much flattened behind the acetabula ; so 

 that what in the other Struthionidse (except Apteryx) is the supratrochanteric process, 

 is here but the external angle of this dorsally flattened expanse of bone. The ilium does 

 not extend back either so far as the ischium or pubis ; and the two latter bones slightly 

 unite distad. The interobturator processes (tending to separate off the most preaxial 

 part of the obturator foramen) axe faint, and thus resemble those of Apteryx, though 

 they are rather more marked than in that genus. 



Viewed ventrally the pelvis is remarkable for its extreme breadth, exceeding in this 

 respect all the other Struthionidae, and this not only absolutely, but relatively also. 

 Between the acetabula are the two large fossae (fig. A2,ff) already spoken of as 

 conditioned by the non-development of the transverse processes of the more postaxial 

 lumbo-sacral vertebrae. These fossae are subcrescentic, with the convexity of each cres- 

 cent mediad. In the Apteryx they are more elongated; in Drommus and Casuarius 

 they are very small indeed. In the specimens examined the ilio-pectineal processes 

 are very little developed, thus differing greatly from Apteryx. 



Viewed dorsally the most noticeable distinctive feature is the excessive breadth of the 

 more postaxial part of the pelvis. 



The ilium has had its main characters already noticed. 



The pubis is more slender relatively than in any genus except Apteryx, in which the 

 slenderness is considerably more remarkable still. 



The ischium in its dorso-ventral breadth, and in its great divergence ventrad from 

 the ilium, closely resembles the ischium of Apteryx, and differs from that of every other 

 genus of Struthionidse. 



THE RIBS. 



There appear to be eight vertebral ribs on each side ; and of these the fourth, fifth, 

 and sixth (or at least the fourth and fifth) join the sternum by the intervention of 

 sternal ribs. In their curvature the vertebral ribs resemble those of Casuarius, but 

 they are more slender and more equal in length. The third, fourth, fifth, sixth, and 

 seventh are the longest, and are of very similar length and slenderness. There are no 

 indications of uncinate processes. The sternal ribs seem also to be slender. They 



