388 oallo-grall.t:. 



Colymbus septentrionalis. 



Colymhus septentrionalis, LinniBus. 8yst. iS^at. i. p. 220 (1706) ; 

 B. 0. U. List Brit. B. p. 202 (1SS3). 



The Pved-throated Diver. 



Hah. Northern Europe, Asia, and America, ranging south in 

 winter. 



1945. Skeleton. 0. C. 11G5a. 



1946. Skeleton of young. 0. C. UGG A. (Skull wanting.) 



Purchased. 



1947. Skeleton. Many of the bones mounted in the Separate 



Series. 0. C. 11()Gb. Hxinterian. 



1948. Sternum, with right coracoid, scapula, and furcula. S. S. 



8r)o. Purc]iai<ed. 



1949. Pelvis and bones of right leg. 0. 0. 1 1()(k 



Ihvokcs Collection. 



Family PODICIPEDIDJC *. 



[Cf. Stejuoger, Stand. Xat. Hist., Birds, p. GO ; Seebohm, 

 Classif. B. p. 41.] 



A. Palate schizognathous. 



B. Cnemial process of the tibia produced to a remarkable 



degree. 



C. Posterior process of ilium approximated to such an extent 



that the sacrum is almost entirely concealed. 

 U. Cervical vertebrre 17 to 21 in number. 



E. Anchylosed sacral vertel)r<ie preceded by a free vertebra, in 



front of which are four anchylosed dorsal vertebrrTe. 



F. Median xiphioid process of sternum abruptly truncated, so 



that the lateral processes extend behind it. 



G. Spinal feather-tract not defined on the neck. 

 H. Ambiens and femoro-caudal muscles absent. 



* = Order Fodidpiiliformex^ Shnrjie, lit'view, p. 71. 



