169 
contemporary with the Dodo in Mauritius. 
specimen represents had powers of flight, there is the greater 
probability of some stray representative being still discoverable, 
like the Notornis in New Zealand, in some uncultivated and 
sequestered part of the island. 
The specimen includes the ‘ gonys ’ or symphysial part of 
of the lower jaw, with the thicker inferior part of the two f rami, J 
the parts preserved measuring 2 inches in length, and 1 inch 9 
lines in breadth. The length of the gonys at the mid line or 
symphysis is 1 inch, the breadth of the gonys, as far as pre¬ 
served, is 1 inch 3 lines; but the thin upper or lateral margins 
have been broken away, at the commencement of the rami, 
down to their thicker convex inferior border. 
The outer surface of the gonys shows a less rounded and 
more angular transverse convexity than in the Ara’s (fig. 3.); 
Fig. 3. 
Under or outer view of lower jaw, Arci macao (Linn.). 
the sides bend up upon the mid tract at almost the same angles 
as in the lower mandible of the great Australian Cockatoos 
(Microglossum ). In the breadth of the back part of the gonys, 
and in the angles at which the lower borders of the rami 
diverge backwards therefrom, the Mauritian specimen also re¬ 
sembles Microglossum more than it does Ara. Near the anterior 
