1890.] 



ANATOMY OF PODICA SENEGALENSIS. 



435 



Judging from the figures given by Brandt and from Giebel's de- 

 scription, there are no noteworthj- points of difference between Poclica 

 and HeUornis in the skull. 



The sternum of Poclica (fig. 4, p. 435), as far as Grebes, Rails, and 

 Divers are concerned, is decidedly peculiar. Giebel has also noted 

 this with regard to Podoa. 



In general shape it is perhaps as much like that of Eurypyga 



Sternum of Podica senegalensis, rentral view ; nat. size. 



Co., Coracoid; cl., clavicle (only shown on left side) ; y.cl., articulation of 

 clavicle, shown from the side. 



helias as of any other bird with which it can be reasonably supposed 

 to be related, but its two lateral margins are more concave and the 

 lateral processes extend for a short distance beyond the median 

 part of the sternum. The keel also is less developed in proportion. 

 In this character it is Rail-like, but in Colymhus, as in other birds, 



