Osteology o/Aranius scolopaceus. 49 
to shew the justice of my comparisons of this part of the 
sternum in Aramus with that in the Cranes sensu stricto. 
I may finally observe that the coracoids of Aramus overlap 
at their articulation, as they do in Baleaynca, but not in 
Grus. 
§ Pelvis. 
The pelvis of Aramus (fig. 2, p. 42) presents no marked 
divergences from that part of the skeleton in Grus and 
Balearica ; nevertheless it can be readily distinguished by 
certain characteristics of its own. The chief difference in 
the pelves of these various Gruine birds consists in the ratio 
of the pre-acetabular to the post-acetabular half of the 
ilium ; this is shown very plainly in the following series of 
measurements : — 
mm. mm. 
Aramus scolopaceus 44 40 
Grus carunculata 81 81 
Grus australasiana ^^ 92 
Tetrapteryx paradisea 75 82 
Balearica chrysopelargiis 75 79 
The measurements were in every case made from the 
anterior end of the ilium to the anterior edge of the 
acetabular cavity, and again from the anterior edge of the 
acetabular cavity to the posterior end of the ilium. It is 
plain from them that Aramus has a relatively longer pre- 
acetabular regrion than has anv other Crane. These 
measurements do not bring out any resemblance between 
Aramus and Balearica ; on the contrary, Balearica is in 
the proportions of the two halves of the pelvis much more 
closely allied to Tetrapteryx. I may add that in these same 
proportions Aramus is less Crane-like than are Psophia, 
Cariama, and Rhinochetus ; but it will be noted also that the 
true Cranes difi'er very considerably among themselves in the 
pre-acetabular and post-acetabular lengths. The breadth of 
the ilium of Aramus is greater in proportion to the length of 
the same than in any Crane of which I have made measure- 
ments, with the exception of Balearica. This will be 
SER. VIII. VOL. II. E 
