26 CLASSIFICATION OF RIRDS. 
Suborder 18. SLEGANOPODES. 
The Pelicans, Cormorants, and their allics are easily diagnosed :— 
A. Palate desmognathous. B. Sternum not perforated to receive the feet of the coracoids. 
C. Mandible not produced and recurved behind its articulation with the quadrate. 
D. Plumage of neck continuous. 
Other characters may be added :— 
E. Basipterygoid processes absent. 

















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The Steganopodes include the following families :—Sulidée, Phalacrocoracide, Pelecanide, 
Phaetontide, and Fregatide, which are very easily diagnosed by excellent osteological cha- 
racters (Seebohm, ‘ Ibis,’ 1889, p. 102). 
Fregatide.—Clayicle ankylosed to sternum; no complete carotid arches on cervical 
vertebree. 
Phaetontide.—Nasal apertures large ; palatines not coalesced. 
Pelecanide.—Clavicle ankylosed to sternum ; dorsal vertebrae heteroccelous. 
Sulide.—Clayicle not ankylosed to sternum ; dorsal vertebre without ventral processes. 
Phalacrocoracide.—Dorsal yertebre with ventral processes, and opisthoccelous. 
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