PELICANIDJE.] OSTEOLOGIA AVIUM. [DlOMEDINiE, 



Diomedia, Linn. 



Exulans, Linn. 



Cranium with two very deep channels above the orbits, but not continued to the outer 

 edge, as in Procellaria, terminating with two large foramina behind the lacrymal 

 bones ; masseter impression strong ; post orbital processes turned slightly downwards, 

 and broad in front. Palatine bones similar to Procellaria gigantea ; lacrymal bones 

 curved backwards, thus forming one side of the foramen terminating the muscular 

 impression above the orbits ; nares placed on each side not having a joint sheath as in 

 Procellaria, but each having a separate one. 



Sternum very broad and short ; keel rudimentary as it approaches the central portion 

 of the posterior margin ; lateral portions projecting furthest on the posterior margin, 

 and sloped gradually towards the indentation in the centre, perforated by a small 

 foramen in the centre ; manubrial process very small ; keel arched below, and not 

 anchylosed to the sternum. 



Pelvis similar to that of Procellaria gigantea. 



Furculum of moderate strength, regularly arched on its anterior aspect from its 

 junction with the coracoids, slightly flattened at junction of the rami. 



Coracoids very broad at their articulation with the sternum, very short, and 

 strong. 



Scapula long, of nearly equal breadth until near the extremity, when they are 

 gradually widened, rounded at their points. 



Wing-bones very long ; ulna longer than humerus ; thumb reaching for two-thirds 

 the length of the metacarpus. 



Leg-bones. Fibula reaching for two-thirds the length of the tibia, end of which is 

 prolonged beyond its junction with the femur, and forming a broad horizontal plate 

 downwards. 



Metatarsus with a channel extending for its whole length down the front, and for 

 about half its length down the back from the calx, which is very smalL 



Measurements. 



Inches. 



Length of humerus . . . . . 16 



Length of ulna 16 



Length of metacarpus 5? 



Length of femur 3? 



Length of tibia 8^ 



Length of metatarsus 4 1 6 



Length of sternum 7 



Inches. 



Breadth of posterior margin of sternum 4^ 

 Breadth of anterior margin of sternum 5 



Depth of keel lf 



Length of head 10 x 5 



Breadth of head 3-fo 



Length of pelvis 7 



Breadth of pelvis 3^ 



Illustrations. 



Skeleton, Plate IX. L. I Pelvis, sternum, palatine bones, and metatarsi, 



Plate XXXVII. fig. 1. 

 224 



