THE BIRDS OF AUSTRALIA. 
Leucalcyon, Melanalcyon^ Todiramphus and Todalcyon. Another stock 
produced the Syma-Hyposyma-Antisyma series, and this may be allied to 
the Actenoides-Caridagrus development. Melidora may represent a phase 
in the latter, as I note the nestlings of all this series have the bill hooked 
at the tip. 
I consider Lazulena and Dilazula as a higher phase evolved from 
the Sauropatis ancestry. 
It is imperative to remember that the peculiar development in this 
Order has duplicated similar structural features over and over again. It is 
possible that anatomical inquiry would lay some of these developments 
bare, as instance, the relationship of the Syma series. 
I might observe that the serrated bill edges of Syma are obsoletely 
seen in other species, as instance, Alcedo cyanoventris Vieillot, while its 
long wedge tail is equalled in Gittura, a genus admitted by Sharpe in the 
Catalogue of the Birds in the British Museum. 
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