CoLYMBIDJS.] 



Skeleton, Plate I. L. 



OSTEOLOGIA AVIUM. 



PoDTCEPSINJE. 



Illustrations. 



Sternum, pelvis, palatine bones, and meta- 

 tarsus, Plate XL. fig. 2. 



Podiceps, Lath, 



Minor, Linn. 



Cranium. Palatine bones broad at hinder ends, and bent downwards at their edges, 

 gradually tapering forwards ; interarticular bones slightly bent outwards. 



Sternum very broad behind, with two very large and open fissures ; keel narrow, not 

 carried forward beyond the anterior edge of the horizontal portion of the sternum ; 

 without any manubrial process. 



Pelvis similar to that of Colymbus, but with the ends of the os pubis not widened. 



Leg-bones. Tibia long, anterior process elongated forwards and inwards to a point ; 

 calcineal bones short. 



Furculum slight, without any process at the junction of the rami. 



Coracoids short. 



I have also the skeleton of Podiceps cristatus, which is similar to the foregoing. 



Measurements. 



Tenths. 



Length of humerus 20 



Length of ulna 19 



Length of metacarpus 9 



Length of femur 10| 



Length of tibia 28 



Length of metatarsus 14 



Length of sternum ...... 15 



Tenths, 

 Breadth of posterior margin of sternum 14 

 Breadth of anterior margin of sternum 10 



Depth of keel 3 



Length of head 19 



Breadth of head 7 



Length of pelvis 23 



Breadth of pelvis 7 



Podiceps, Lath. 



Cristatus, Linn. 

 Similar to the foregoing, except in size, and distinguished as in Cotymbus by a long 

 spine on each side of the caudal vertebras. 



Illustrations. 



Skeleton Plate XXIV. 



Sternum, pelvis, palatine bones, and 



metatarsi, Plate XL. 



214 



Skeleton, Plate XXI. 

 Sternum, palatine bones, metatarsi, and 

 pelvis, Plate XL. fig. 1. 



