FEET OF HESPERORNIS. 107 



truncated obliquely, making the outer margin of the bone considerably 

 shorter than the inner. The shaft of the bone is depressed, and the outer 

 and inner margins converge distally. 



The second phalanx of this digit (Plate XIX, figure 2) is somewhat 

 similar to the first, but shorter, and much more slender. The extremities 

 are less obliquely truncated, and the shaft and distal end are much more 

 flattened. The articular faces of this phalanx, as well as of the others in 

 this digit, admit of considerable rotation, but have the crescent and peg 

 articulation only partially developed. 



The terminal phalanx of the second digit (Plate XIX, figure 3) is 

 short, much depressed, and pointed at its distal end. Seen from above, it is 

 wedge-shaped in outline, with the proximal articulation at right angles to 

 the axis of the bone. In its natural position, this phalanx had its superior 

 surface turned more or less outward, and during recovery after the back- 

 ward stroke it was turned edgewise, so that this face looked entirely outward. 



The measurements of the phalanges of the second digit in Hesperornis 

 regalis, and Hesperornis crassipes, are given in the tables below : 



Measurements of First Phalanx of Second Digit. {Hesperornis regalis, No. 1206.) 



Greatest diameter of proximal end, 14.5 mm 



Vertical diameter of proximal end, 12.0 



Transverse diameter of proximal end, 13.0 



Vertical diameter of proximal articulation, 11.0 



Transverse diameter of proximal articulation, 11.0 



Measurements. (No. 1476.) 



Length of first phalanx, 42.0 mm 



Greatest diameter of proximal end, 15.0 



Vertical diameter of proximal end, 13.0 



Transverse diameter of proximal end, 13.8 



Vertical diameter of proximal articulation, 11.0 



Transverse diameter of proximal articulation, 10.2 



Least vertical diameter of shaft, 6.5 



Least transverse diameter of shaft, 8.5 



Greatest vertical diameter of distal end, 9.0 



Least vertical diameter of distal end, 8.0 



Transverse diameter of distal end, 9.0 



