ANSERIFORMES. 25 
Order PELECANO-HERODIONES. 
The Pelecano-Herodiones may be diagnosed by the following four characters :— 
A. Spinal feather-tract not defined on the neck. B. Flexor perforans digitorum not 
leading to the hallux. ©. Young born helpless, but passing through a downy 
stage. D. Palate desmognathous. 






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The Pelecano-Herodiones differ from each other very much in their myological formula, 
which is varied as follows:—A+, A—, AX+, XY+, AXY+, AXY-, and ABXY+; 
nevertheless they were atl included by Garrod in his Ciconiiformes. 
The femoro-caudal (A) is absent in some species and present in others in the following 
suborders :—Coracie, Cathartes, Herodiones, Gayie, Gralle, Fulicariv, Pygopodes, Gallinie, 
Casuarii, and Struthiones. 
The semitendinosus (X) is always present except in the Accipitres, the Striges, the Trochili, 
in some of the Steganopodes, and some of the Coraciz. 
Whenever the semitendinosus is absent the accessory semitendinosus (Y) is also absent. 
To the fiye exceptions above named must be added the Trogones, the Anseres, the Impennes, 
sand some of the Passeres, Scansores, Halcyones, Tubinares, Gavi, and Pygopodes. 
