REPORT ON THE BONES OF THE HUMAN SKELETON. 
11 
obturator foramen in tbe males was 50 '5, the mean transverse 33 mm., and in all these 
the vertical diameter very considerably exceeded the transverse; the mean obturator index 
was 65. In the female pelvis these diameters were more nearly equal, and the obturator 
index was as high as 85. The subpubic angle showed a considerable range of variation 
in the males, viz., from 47 to 70 , with a mean of 6 1 0 *5, and it is somewhat remarkable 
that the pelvis from Queensland, which was the broadest both in its external dimensions 
and at the brim, should have had so small a pubic angle as 47°. In the female 
the subpubic angle of 89° was considerably greater than in the male with the widest 
angle. 
The greatest transverse diameter of the brim was nearly 3 cm. in front of the sacro- 
iliac joint, from which point the brim sloped downwards, forwards, and inwards to 
the pubic symphysis so as to give a cuneiform outline to the brim. In the Manly Cove 
specimen the transverse diameter of the brim was considerably less than the conjugate, 
so that the pelvic index was as much as 116; in the other pelves the transverse 
diameter exceeded the conjugate, though to a very slight extent in two of the adult 
males. The transverse diameter of the brim in these males ranged from 98 to 123 
mm., and the mean was 110'5. The conjugate diameter ranged from 96 to 114 mm., 
and the mean w T as 106. The mean pelvic or brim index was 97. In each male pelvis 
the intertuberal diameter was markedly below the transverse diameter of the brim, 
but in the only female the intertuberal approximated more to that of the transverse. 
The mean inferior sagittal diameter in the adult males was 103 mm., which was slightly 
below the mean conjugate. 
The pubic symphysis in the adult males ranged in depth from 36 to 42 mm. The 
pelvic cavity ranged in depth in the males from 89 to 100 mm., and its mean was 
95 mm., which was considerably higher than that of the only female Australian 
measured. The pubo-innominate index, which expresses the proportion contributed by 
the os pubis to the breadth of the innominate bone, had a mean in the adult males of 45 ; 
in the only female this index was 44. A comparison of the lengths of the ilium and 
ischium shows the ilium to bear a much larger proportion to the height of the in- 
nominate bone than the ischium. The maximum length of the male ilium was 124 mm., 
the minimum 110 mm. The mean iliac index was 129. The maximum length of 
the ischium was 95 mm., the minimum 77 mm. In the Riverina pelvis the ischium is 
two-thirds the length of the ilium, but in the other males the ischium was more than 
two-thirds, and in the Queensland specimen it was about four-fifths the length of the 
ilium. In the female, again, the ischium was not quite two-thirds the length of the 
ilium. The ischio-innominate index, which expresses the proportion contributed by the 
ischium to the height of the pelvis, had a mean in the adult males of 43 ; in the only 
female this index was 40. In three of the adult males the length of the sacrum 
exceeded the breadth, and the sacral index was consequently less than 100 ; in two 
