1902.] 



OSTEOLOGY OF THE FALCOXIFOEMES. 



305 



Aquila, Thrasa'etus, Haliaetus, Circaetits, ior example, the post-ilia 

 pass insensibly backward into the ischium, instead of abruptly. 



Text-fi^. 37. 



Dorsal aspect of the Pelvis of Pandion haUaetus. 



As ill the pelvis of Cathartes, the preacetabular ilia fail to rise above the neural 

 spines of the vertebra?. A pair of canales ileo-Iumbales are present, but most 

 of the intertransverse sacral foramina have become filled up. The great breadth 

 of the pelvis, as shown in text-fig. 36, p. 303, is caused by the unusual length of 

 the sacral ribs and transverse processes. 



In the majority of Accipitres the pre- is longer, sometimes 

 nearly twice as long, than the postacetabular ilium, which is 

 markedly deflected. 



The ischimn is generally truncated posteriorly, but in some, 

 as in Thrasaetus and Aquila for example, the posterior end is 

 hastate. 



The j9tt6is is generally long and slender, and at the level 

 of the end of the ischium turns abruptly inwai-ds towards the 

 middle line nearly meeting its fellow of the opposite side. In 

 Thrasaetus, Lophaetus, Parabuteo, it is vestigial, only the proximal 

 end. remaining. This terminates immediately behind the ob- 

 turator foiamen, and serves to close it, often by fusion with the 



