164 ODONTORNITHES. 



Measurements of Pelvic Bones. (Ichthyomis victor, ~So. 1732.) 



Distance across pelvis between upper margins of acetabula, 20. mm 



Extent of ilium, in front of acetabulum, 20. 



Greatest breadth of ilium, in front of acetabulum, 8.5 



Least breadth of ilium, in front of acetabulum, 5. 



Height of ilium, above acetabulum, 4. 



Extent of ischium, behind acetabulum, 22.5 



Vertical diameter of shaft of ischium, 3.5 



Greatest vertical diameter of ischium, 5.8 



Transverse diameter of shaft of ischium, 1.5 



Extent of pubis, behind acetabulum, 20. 



Vertical diameter of shaft, 1.5 



Vertical diameter of pubis, at distal end, 2.5 



The pelvic bones of Apatomis (Plate XXXII, figure 1) are very 

 similar in form and proportions to those of Ichthyomis. The pre-acetabular 

 part of the ilium is much more extensive than the posterior portion. The 

 acetabulum is perforate, but the foramen (a/) is of moderate size. The 

 ischium does not coalesce with the posterior part of the ilium, and its 

 distal end was free, as in Iclithyornis and Hesperomis, and a few modern 

 reptilian birds. The post-pubic element of the pelvis is longer than in 

 Iclithyornis, and also much longer than the ischium. 



Measurements of Pelvic Bones. (Apatomis celer, No. 1732.) 



Length of ilium, 50. mm 



Distance from front of ilium to distal end of pubis, 62. 



Distance from front of ilium to distal end of ischium (approximate, 57. 



Extent of pubis, behind acetabulum, 32. 



Extent of ischium, behind acetabulum (approximate), 26.5 



