232 THE DESEADO FORMATION OF PATAGONIA 
Of the phalanges, I have two unguals which are narrow 
curved claws. These were not found in association with 
any of the foregoing bones, but correspond in size and 
general character to those of Pelecyornis, and so I consider 
them as belonging to this genus and species. 
Fig. 160. Femur of 
unknown bird—natural 
Fig. 150. Ungual pha- , 
eee, Si ctearp ras size; special No. 3217. 
lanx—1/2 natural size. 
Ameghino has suggested that the genus was related to 
ducks, but with the more complete material it seems, in 
general build, much closer to the aberrant land birds of the 
Tertiary of South America, Pelecyornis and Phororhacus; 
and I am not in position to say what their derivation may 
have been. 
Beside the above species there are several more or less 
complete but isolated bones indicating the presence of other 
and much smaller birds. I figure such a femur natural size. 
