1890.] 



ANATOMY OF PODICA SENEGALENSIS. 



437 



the genus Podica has been already especially compared on account 

 of the skull characters. Three ribs are covered at their origin by the 

 ilia, which just fall short of the posterior margin of the next rib in 

 front. 



In Fiillca only one rib is thus covered, the pelvis being placed 



Pelvis of Podica senegalensis, dorsal view; nat. size. 



further back. In the Divers and Grebes there are two ribs thus 

 covered over by the ilia. 



In Ocydromus australis the ilia completely cover the origin of one 

 pair of libs and nearly reach over another, so that there is no great 

 use to be made of this point. 



The pelvis of Heliornis shows the same peculiarities as that of 

 Podica ; the pubes are in the same way united with the ischia and pro- 

 longed beyond them ; the fused neural spines of the lumbar vertebrae 



Proc. ZooL. Soc— 1890, No. XXX. 30 



