ANATIDiE.] OSTEOLOGIA AVIUM. [CYGNIN2E ? 



broad at their junction with the palatines. Lower mandible and other bones also 

 similar. 



Sternum with a manubrial process. 



Bernicla, Steph. 



Magellanica, Gmel. 



Similar to Brenta, but with the fissures at the posterior margin of the sternum 

 generally closed by a thin strip of bone, thus converting them into foramina ; anterior 

 edge without a manubrial process. 



Anser, Barm, 



Cygnoides, Linn, 



Similar to the foregoing except in size, and having a knob at the base of the bill ; 

 the sternum with a distinct manubrial process. 



I have also a specimen of A. segetum, which is similar to Cygnoides, but without the 

 knob at the base of the bill. 



Cygnus, Linn, 



Coscoroba, Moll, 



Cranium with a deep depression at the base of the nasal bones ; orbital septum with 

 two foramina ; occipital crest and protuberance well marked ; foramen magnum very 

 large. Palatine bones similar to Plectropterus, but much broader and stronger; 

 inferior maxillary much prolonged beyond the condyles ; a slight channel from the 

 vertex to the nasal depression. 



Sternum large, broad, similar in shape to Plectropterus, but the lower edge of the 

 keel very slightly arched, with a short, thick manubrial process, pierced perpendicularly 

 with a foramen. 



Pelvis not differing from the geese. 



Furculum also similar to the Anserince, but much stronger. 



Scapula very long. 



Wing-bones with the ulna shorter than the humerus. Terminal joint of the caudal 

 vertebrae very long. 



Measurements. 



Tenths. 



Length of humerus ..... 80 



Length of ulna 70 



Length of metacarpus 38 



Tenths. 



Length of femur ...... 32 



Length of tibia 64 



Length of metatarsus 36 



2 m 205 



