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This is not at the coccyx, but rather at the anterior commissure of the perineum. This is so greatly distended at the last moment of labor as to much prolong the posterior wall of the pelvic excavation and the canal to be traversed by the fœtus. (Fig. 8).

Fig. 9—Section of sacrum and pubis.

Measuring superior strait.

Fig. 10.

Measuring inferior strait.