Anatid^e.] 



OSTEOLOGIA AVIUM. 



[FuLIGULIN^I. 



Somateria, Leach. 



Mollissima, Linn. 



Cranium very strong. Palatine bones very similar to Nyroca, the hinder and outer 

 angle bent downwards, placed far apart, and slightly bent inwards in the centre. 

 Nasal bones are terminated by a sharp spine projecting upwards and backwards, and 

 another projecting downwards in the place where the lacrymal bones usually are ; but 

 I can trace no vestige of anchylosis between this process and the nasal bones. The 

 skeleton I have, however, is that of a very old bird. 



Pelvis broad, similar to Clangula. 



Sternum very large and strong ; anterior edge of the keel scolloped out, the point 

 not projecting far forwards before the rest of the sternum, the strips of bone bounding 

 the foramina on the outer sides very broad. 



Measurements. 



Tenths. 



Length of humerus 40 



Length of ulna 36 



Length of metacarpus 23 



Length of femur 25 



Length of tibia 38 



Length of metatarsus 21 \ 



Length of sternum 43 



Tenths. 

 Breadth of posterior margin of sternum 30 

 Breadth of anterior margin of sternum 25 



Depth of keel 8 



Length of head ....... 4T 



Breadth of head 12 



Length of pelvis 50 



Breadth of pelvis 24 



Erismatura, Bon. 



Leucocephala, Scop. 



Cranium strong. Palatine bones broad at their anterior extremities, and gradually 

 narrowed to their junction with the interarticular bones, where they nearly touch ; 

 interarticular bones broad at their junction with the palatine bones, and narrowed 

 rather suddenly backwards. 



Sternum with the keel very narrow ; hinder margin with two foramina, rather small ; 

 posterior margin much broader than the anterior ; anterior edge of keel scolloped out. 



Pelvis with the ischiadic and obturator foramina very large, the os pubis not turned 

 inwards. 



Leg-bones. Metatarsal bones flattened, a rather deep groove in front. 



Measurements. 



Tenths. 



Length of humerus 25 



Length of ulna 23 



Length of metacarpus 12 J 



Tenths. 



Length of femur ...... 15 



Length of tibia 25 



Length of metatarsus 13 



211 



