84 



University of California Publications. 



[Geology 



once noticeable on comparing the tarsi from the anterior aspect. There is 

 noticeable also an elevation of the inner border of the inner tibial facet 

 to a degree exceeding that seen in the existing species. 



The anterior border of the shaft in 2E. occidentalis is almost perfectly 

 straight, whereas the same profile in /E. lucasi is decidedly convex. 



The coraeoid assigned to this species is distinguishable from that of the 

 existing form by its greater length and its very slender shaft. In total 

 length along the inner border, the cotype exceeds the Eecent species by 

 three and seven-tenths (3.7) millimeters. The actual transverse diameter 

 of the shaft is, however, three-tenths (0.3) millimeters less at its narrowest 

 point. 



Figs. 1 and 2. — JEchmophorus lucasi. Femur, natural size. Fig. 1, posterior 

 view; fig. 2, lateral view. 



Fig. 3. — ^Eclimophorus lucasi. Tarsometatarsus, anterior view, natural size. 



The several differences between the extinct form and the liv- 

 ing one seem to point toward the former as a bird of slightly 

 larger body size, as indicated by the longer coraeoid ; but pos- 

 sibly of weaker powers of flight, as is suggested by the slender- 

 ness of that bone. The swimming powers may have been greater, 

 since the posterior limb shows greater robustness of its proximal 

 segment, the femur, and greater length of its distal segment, the 

 tarsus. 



