Anatidje.] osteologia avium. [Fuligulin^. 



Chaulelasmus, G. R. Gray. 

 Strepera, Linn. 



Cranium narrow between the upper edges of the orbits ; orbital septum with two 

 foramina. Falatine bones similar in form and position to the last, but contracted in 

 the middle. 



Sternum as in the last. 



Pelvis with the ischiadic foramen very large, oval ; immediately behind it another 

 foramen, divided from it by a strip of bone, rounded; obturator foramen large, 

 broadest at the hinder extremity ; hind toe very long. 



Other bones similar to Anas, 



Spatula, Boie. 



Clypeata, Linn. 



Sternum very short, but in form similar to the preceding. 

 Pelvis similar, and has the same three foramina. 



Petrocyanea, Bon. 



Cserulata, Licht. 



I have only the sternum of this bird, which is not so broad as in Spatula in propor 

 tion to its length, and has a long triangular manubrial process, blunt at the extremity 

 In other respects similar. 



Oidemia, Flem. 



Nigra, Linn. 



Cranium. Space between upper edges of the orbits; narrow orbital septum with 

 one foramen. Palatine bones narrow for the hinder half, then becoming gradually 

 broader, and bent outwards ; interarticular bones broadest at their junction with the 

 palatines, and gradually narrowed backward. 



Sternum broad and long, with a xiphisternal piece projecting between the two 

 fissures, which are broad, but not very deep, the strip of bone bounding them 

 externally bent inwards at the tips, and edge very slightly scolloped out; lower edge 

 of the keel arched anteriorly. 



Pelvis long ; ischiadic foramen large, oval ; obturator of moderate size ; os pubis 

 long, expanded at the tips, and bent much inwards. 



Wing-bones. Humerus longer than the ulna. 



Leg-bones. Fibula extending for nearly the whole length of the tibia ; calcineal 

 process small ; toes long ; metatarsi short. 



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