Pelicanidje.] osteologia avium. [Peocellarin^:. 



Ribs with the styliform processes longer than in Pelicanus. 



Furculum anchylosed to the point of the sternum on its anterior aspect, much arched, 

 laterally flattened, the hinder portion widened. 



Scapula strong, widened near the hinder extremity, and sloped to a point. 



Wing-bones. Ulna much shorter than humerus; thumb half the length of the 

 metacarpus. 



Leg-bones. Metatarsus flattened ; a deep groove at the back. 



Measurements. 



Inches. 



Length of humerus ..... 8 J 



Length of ulna 7 J 



Length of metacarpus 3/ 



Length of femur 3 



Length of tibia 3^ 



Length of metatarsus 2^ 



Length of sternum 5f 



Inches. 



Breadth of posterior margin of sternum 2^ 



Breadth of anterior margin of sternum 2^ 



Depth of keel 1^ 



Length of head 7 X 6 



Breadth of head 2 X 2 



Length of pelvis • . 6 



Breadth of pelvis l x 9 



Illustration. 

 Skeleton, Plate VI. L. 



Procellaria, Linn. 



Gigantea, Gm. 



Cranium very strong, two deep indentations extending over each orbit ; masseter 

 impression also strong; orbital septum with one rounded foramen ; post orbital pro- 

 cesses of moderate size. Palatine bones broadest about a quarter of an inch from the 

 interarticular, to which bones they are gradually sloped off on their outer edges, the 

 interior edge of each palatine bone much bent perpendicularly downwards, and 

 narrowed gradually forwards. 



Sternum similar in general form to Pelicanus, but differs in having the anterior edge 

 of the keel scolloped out, and point not much advanced beyond the horizontal portion 

 of the sternum, which is also more convex ; on the anterior edge of the keel is a 

 flattened but large and triangular manubrial process. 



Pelvis truncated on anterior extremity, and not extending beyond last rib. 



Wing-bones with the ulna not so long as the humerus ; thumb three-parts as long as 

 the metacarpus. 



Leg-bones. Extension of the tibial crests reaching even with the femur, and very 

 broad ; the metatarsus rather long for a water bird, in proportion to the tibia ; a spur 

 on the hinder edge ; calx very small, a channel both before and behind. 



Ribs with very long styliform processes. 



2q 221 



