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Show 1890.] ANATOMY OF PODICA SENEGALENSIS. 435 Judging from the figures given by Brandt and from Giebel's description, there are no noteworthy points of difference between Podica and Heliornis in the skull. The sternum of Podica (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 Fig. 4. Sternum of Podica senegalensis, ventral view; nat. size. Co., Coracoid; cl., clavicle (only shown on left side); Xcl., 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 Colymbus, as in other birds, |