28 DESCRIPTION OP THE SKELETON. 



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lower part diners in having no sub-pubic arch. The three great bones 

 of the pelvis are co-ossified. The width across the anterior spinous 

 processes is six feet two inches ; the depth of the pelvis, from the summit 

 of the symphysis pubis to the summit of the pubic arch, is thirty inches. 



The foramen ovale is situated four inches below the superior opening 

 of the pelvis. The surface in which this foramen is placed, represents an 

 inclined plane, beginning with the postero-superior edge of the os pubis, 

 and terminating in the inferior part of the os ischium. It measures nine 

 inches in the vertical direction, and five in the transverse. The outlet 

 measures across its brim twenty-two inches ; from the pubis to the sacrum, 

 twenty-one inches, 

 os Os Innominatum. — The supero-anterior edge is surmounted by a 



tum . very thick, rough crest, elevated near the sacrum, depressed at the spinous 

 process, and exhibiting the state of epiphysis through the greater part of 

 its course. Continued downwards and backwards from the thick anterior 

 summit of the spinous process, this edge becomes thinner ; then enlarges 

 towards the pubes, where it is very thick. The pubic bones are consolidated. 

 Below the symphysis is a fissure extending nine inches downwards, where 

 it terminates in a co-ossification of the ischiatic bones ; and there they are 

 massive. The posterior ascending edge of the ischium is of great thickness 

 at the lower part, becomes thinner at the upper, terminating in the tuber- 

 osity, the thinnest part of this edge. Above this tuberosity is the ischiatic 

 notch, the edge of which is thin and rough, till it strikes that of the os 

 sacrum ; thence, arising to the superior anterior juncture of the sacrum with 

 the os imiominatum, it is very thick, and co-ossified with this bone. 



The anterior face of the os innominatum is moderately excavated, 

 looking a little downwards. Towards the pubic portion, it presents a 



