158 ODONTORNITHES. 



point, and only moderately thickened at the edge. An oblique ridge is, 

 however, slightly indicated, passing across the expansion from near the 

 middle of the shaft of the bone toward the outer margin, but low through- 

 out, and indicated at the margin by only a very slight thickening. 

 Beyond this thickening, the margin is suddenly excavated, and the ter- 

 minal hook-like process, seen in Ichtliyornis, is wanting. The articular 

 faces resemble those of Ichtliyornis, and there is the same distinct scar 

 just beyond the middle of the anconal surface of the shaft, and also near 

 the distal end of the ulnar expansion on the palmar side. 



The second phalanx of the same digit is slender, and tapers from the 

 proximal end to a blunt point distally. The proximal articular face is 

 nearly flat, or slightly concave, sub-triangular in outline, with a prominent 

 lobe at the radio-palmar angle of the surface. From the base of this 

 lobe, a groove is continued a short distance upon the bone. The front or 

 radial side of this bone, like that of the phalanx supporting it, is nearly 

 flat. The exterior or anconal surface is excavated at the base. 



The first phalanx of the third digit is imperfectly preserved in Ichtliy- 

 ornis victor (number 1775), and somewhat resembles the corresponding 

 bone in Graculus dilophus, Gray. It is, however, rather more flattened 

 proxhnally than in Graculus, and the articular surface is sub-oval. The 

 shaft expands slightly on the radial side near the proximal end, and much 

 more decidedly on the ulnar side a little farther along, where it reaches its 

 greatest diameter. It then tapers rapidly, and is broken off apparently a 

 little beyond the middle of its length. 



The main dimensions of the different of phalanges described above 

 are as follows : 



Measurements of First Phalanx of Second Digit. {Ichtliyornis victor, No. 1463.) 



Length of shaft, 21. mm 



Greatest diameter of proximal end, 6.8 



Transverse diameter of proximal end, 5.2 



Vertical diameter of proximal end, 4.2 



Least diameter of shaft, _ 2.8 



Greatest diameter of shaft, 1.6 



Transverse diameter of distal end. 4.2 



