OSTEOLOGY OF BIRDS 



119 



Pandion has a pelvis very different from the pelvis of any ac- 

 cipitrine we have thus far studied. It. in form, is exceedingly 

 broad, spread out, and flat ; the sacrum being rema.rkably wide op- 

 posite the acetabulae. Anteriorly, the sacral crista is wide from 

 side to side, and the broadly emarginated mesial edges of the ilia 

 completely fuse with its outer margins for some considerable 



Fig. 60 Pelvis of Pandion, natural size and seen upon 

 direct dorsal view. From a specimen in possession of 

 Mr Lucas 



distance. Capacious ilioneural canals are thus created, which are 

 patulous posteriorly. More or fewer interdiapophysial foramina 

 perforate the sacrum, being irregularly dispersed, and it is only 

 between the transverse processes of the last few urosacral verte- 

 brae that they become parial in their arrangement. At the side 

 view of this pelvis, the acetabulum is large and nearly circular; 



