108 ODOXTOKXITHES. 



Measurements of First Phalanx of Second Digit. (Hesperornis crassipes, No. 1474.) 



Length of first phalanx, 40.5 nl 



Greatest diameter of proximal end, 14.5 



Vertical diameter of proximal end, 12.5 



Transverse diameter of proximal end, 13.0 



Vertical diameter of proximal articulation, 12.0 



Transverse diameter of proximal articulation, 10.0 



Greatest vertical diameter of distal end, 8.5 



Least vertical diameter of distal end, 7.5 



Transverse diameter of distal end, 8.0 



3feasurements of Second Phalanx. (Hesperornis regalis, No. 1476.) 



Length of second phalanx, 41. 0" 



Greatest (transverse) diameter of proximal end, 1 0.0 



Vertical diameter of proximal end, 9.0 



Transverse diameter of proximal articulation, 9.0 



Vertical diameter of proximal articulation, 7.2 



Least transverse diameter of shaft, 6.2 



Vertical diameter of shaft, 3.6 



Transverse diameter of distal end, 7.2 



Vertical diameter of distal end, 3.0 



Transverse diameter of distal articulation, 6.5 



Vertical diameters of distal articulation, 2.5-3.0 



Measurements of Third Phalanx. (No. 1476.) 



Length of third phalanx, 15.0™ 



Transverse diameter of proximal end, 7.0 



Vertical diameter of proximal end, 3.3 



The First Digit. (Plates XVIII, XIX and XX.) 

 The metatarsal rudiment of the hallux, or first digit (Plate XIX, 

 figure 4) has already been described. It supported below a first phalanx 

 (Plate XIX, figure 5), much flattened, and of moderate length. The digit 

 was completed by a short, pointed, terminal phalanx (Plate XIX, figure 6), 

 very similar in its general form and proportions to the ungual phalanx of 

 the second digit. The hallux was directed forward and inward, like the 

 first digit of Colymbus, and not backward, as in most modem birds. The 

 diminutive size of this digit in Hesperornis, and the rounded loose joints 

 between the phalanges show that it was of little service in locomotion. 



