104 ODONTORNITHES. 



Measurements of Third Phalanx. {Hesperornis regalis, "No. 1200.) 



Length of third phalanx, 40.0^ 



Greatest diameter of proximal end, 18.0 



Least diameter of jsroximal end, 9.0 



Greatest diameter of proximal articular surface, 15.0 



Least diameter of proximal articular surface, 8.0 



Least fore and aft diameter of shaft, 11.0 



Greatest diameter of distal end, 12.5 



Least diameter of distal end, 5.5 



Greatest diameter of distal articular surface, 10.0 



Diameter of " peg " in distal articular surface, — 4.8 



Measurements. (No. 1206.) 



Length of third phalanx, 41.0™ 



Greatest diameter of proximal end, 17.0 



Least diameter of proximal end, 10.0 



Greatest diameter of proximal articular surface, 15.0 



Least diameter of proximal articular surface, - 10.0 



Least fore and aft diameter of shaft, 11.0 



Least diameter of shaft, 6.0 



Least diameter of distal end, 6.5 



Diameter of " peg " in distal articular surface, 3.0 



Measurements of Fourth Phalanx. {Hesperornis regalis, No. 1200.) 



Greatest diameter of proximal end, 14.0™ 



Least diameter of proximal end, 7.5 



Greatest diameter of proximal articulation, 12.0 



Least diameter of proximal articulation, - - 6.5 



The Third Digit. (Plates XVIII and XX.) 



The third dig-it was very much smaller than the fourth, and was sup- 

 ported by the small middle metatarsal element. It consisted of but four 

 phalanges, and, when at rest, was directed forward and slightly inward. 



The first phalanx (Plate XVIII, figure 5) is shorter than the first 

 in the outer toe, and much more slender, the whole bone being greatly 

 compressed transversely. The proximal extremity is triangular in outline, 

 and its articular face is divided by a sharp vertical ridge. The shaft 

 is somewhat sigmoid longitudinally, and the articulation of the distal 

 end is divided into two sub-equal portions by a nearly vertical groove. 



