THE BIRDS OE AUSTRALIA. 
guess their descent, but it maybe a product of A'prosmictus which arrived at 
Fiji with Layardiella. The wing formula, as might be anticipated, is similar 
to that of Layardiella , but not exactly the same. Six primaries constitute 
the tip, but the third is longest, the fourth a shade less, and the second shorter 
and equal to the fifth, while the first and sixth are subequal. In this case 
also, the evolution has proceeded that immature and female are like the 
male, so that however we consider the relationships of this genus it must be 
admitted as quite distinct generically from everything else. It is difficult to 
suggest that the study of the osteology might help us, as the cranial features 
of the above mentioned series, according to D’Arcy Thompson, are very 
similar. 
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