The total number of serviceable specimens of sacra is 17, only 13 of
which, however (six males and seven females), are five-segment bones
and sufficiently well preserved to afford the necessary measurements.
The results show that, as usual, the male sacrum, while in breadth
nearly equal to that of the female, is perceptibly higher, in
consequence of which the sacral index, or percental relation of breadth
to height, is lower in the males.
A comparison of the Munsee sacra with those of other Indians and United
States whites shows marked agreement both in size and in the relative
proportions of the bone in the males, but less in the females. As will
be seen by the next table, the Munsee female sacrum is somewhat lower
than that of any of the other series.[79]
[79] The sacra from the Arkansas and Louisiana mounds, of which a small
series was reported previously by the writer (_Remains from Arkansas
and Louisiana_, op. cit.), appeared unusually high; in the much larger
series here presented, however, they are seen to form no exception in
this respect to those of other Indians.