Pelicanidjs.] 



OSTEOLOGIA AVIUM. 



[Sulin,e. 



Wing-bones. Ulna much longer than the humerus. 



Leg-bones. Metatarsus in the centre, nearly triangular ; calx large, but not extend- 

 ing far down. 



Measurements. 



Inches. 



Length of humerus 11 J 



Length of ulna . . 13 



Length of metacarpus 5 J 



Length of femur 3f 



Length of tibia 6J 



Length of metatarsus 



41 



*2 



Length of sternum 5J 



Inches. 



Breadth of posterior margin of sternum 3 J 



Breadth of anterior margin of sternum 4^ 



Depth of keel 1^ 



Length of head 17 



Breadth of head 2^ 



Length of pelvis 9J 



Breadth of pelvis 3 a 8 



Illustrations. 



Skeleton Plate VII. L. 



Pelvis, sternum, metatarsi, and palatine 

 bones, Plate XXXVIII. fig. 2. 



Pelicanus, Linn. 



Fuscus, Linn. 



I have the sternum, coracoids, scapula, and furculum of this bird, which, except in 

 size, are precisely similar to the foregoing. 



Sula, Briss. 



Bassana, Linn. 



Cranium very strong ; occipital bone with a strong ridge on its anterior edge, 

 inclining forwards ; occipital prominence very large, the hinder and lower edge termi- 

 nating in a truncate projection; masseter impression strong; post orbital process bifid, 

 pointing outwards and slightly downwards; orbital septum with one large foramen. 

 Palatine bones broad, slightly recurved at their outer edges, anchylosed together, and 

 with a slight ridge down the centre; hinder edge at their junction with the inter- 

 articular bones, somewhat truncate, with a slight spine on their external edges. Inter- 

 articular bones flattened, united to the ridge between the palatines. 



Sternum much longer in proportion to its breadth than in Pelicanus, the keel 

 extending only to one-half the length of the sternum, the point extending far forwards ; 

 manubrial process large ; posterior edge of sternum with two shallow, broad, and open 

 fissures, the outer edges extending beyond the central portion of the sternum. 



Pelvis extending to the three hinder ribs, similar to Pelicanus, but not so broad, 

 and with the obturator foramen much narrower. 

 220 



