AfiDEIDiE.] 



OSTEOLOGIA AVIUM. 



[Ardein^ 



Bibs with a long, thin styliform process. 



Scapula slightly expanded at about two-thirds its length from the tip, then tapering 

 to a point. 



Measurements. 



Tenths. 



Length of humerus 20 



Length of ulna 22 



Length of metacarpus 11 



Length of femur 15 



Length of tibia 30J 



Length of metatarsus 19 



Length of sternum 17 J 



Tenths. 



Breadth of posterior margin of sternum 7 

 Breadth of anterior margin of sternum 8 



Depth of keel 5 



Length of head 37 



Breadth of head 8 



Length of pelvis 20 



Breadth of pelvis 10 



Skeleton, Plate XII. K. 



Illustrations. 



[ Palatine bones, sternum, pelvis, and metatarsal 



I 



bones, Plate XXXV. bis. fig. 2. 



Ardea, Linn. 



Cinerea, Linn. 



Cranium with a depression between the orbits ; orbital septum nearly obliterated ; 

 occipital crest large, protuberance scarcely marked ; masseter impressions very large ; 

 ethmoid bones just visible. Palatine bones truncate at their hinder extremities, with 

 both edges turned downwards, and gradually narrowed from the hinder extremity 

 forwards ; inferior maxillary bone projecting backwards beyond the condyle, flattened 

 on the hinder edge perpendicularly, and bent slightly inwards. 



Sternum rather small, of moderate breadth, with two rather broad shallow fissures, one 

 on each side of the keel, on the posterior margin, the splints bounding the outer sides 

 of the fissures carried as far backwards as the point of the sternum ; keel deep, the 

 lower edge much arched, anterior deeply scolloped out. Manubrial process of 

 moderate size, rounded on the anterior edge, and flattened perpendicularly. 



Pelvis similar in shape to most of the larger waders; obturator and ischiadic 

 foramina large ; os pubis continued beyond the ischium. 

 ' Ribs thin, styliform process of moderate length. 



Furculum long, the rami flattened, anchylosed to the sternum, a transversely 

 flattened process turned inwards between them. 



Scapula long, thin, sloped off at the hinder end to a blunt point. 



Leg-bones with the calcineal process well marked, but not continued down the meta- 

 tarsus ; furnished with a hind toe. 



195 



