228 



THE DESEADO FORMATION OF PATAGONIA 



the contour of the shaft. Between these ridges there is a 

 wide shallow furrow which also loses itself above in the con- 

 vex surface of the shaft. 



Measurements 



Femur, least diam. of the shaft 

 Femur, diameter across the condules 



58 mm. 

 148 mm. 



Physornis sp.? 



Two phalanges of a size too small to belong to the above 

 species represent a second smaller bird of this type, about 

 equal in size to Phororhacus infiatus. I give a figure of 

 one toe but would wail for more typical material before 

 establishing a species. 



Fig. 150. Proximal 

 phalanx of Physornis 

 so? — natural size. 



Fig. 151. Loxornis 

 clivus, lower end of 

 tibio-tarsus, after Ame- 

 ghino- natural size. 



Loxornis Ameghino 



Loxornis Amegh., 1895, Rol. Inst. Geog. Argen., t. 15, p. 595. 



Another group of bones, which we found with consider- 

 able frequency, have the same features as Pelecyornis of 

 the Santa Cruz. Ameghino has described but the lower 

 end of a tibio-tarsus which can be associated with these 

 bones and (o it gave the name Loxornis. I can not find 



