Position of the Fœtus in a presentation of the right shoulder, and in the left cephalo iliac position.

Previous to the rupture of the membranes the child's body lies across, as formerly explained; but immediately after the rupture the shoulders descend into the Pelvis, as seen in the above Plate, while the head remains above the pubes; the arm frequently, but not always, protruding externally.

The shoulder then continues to descend, the body following, bent up against the face, as seen in Plate XXXVI.

PLATE XXXVI.

Descent of the shoulder in a Trunk presentation, at a more advanced period.

Here the shoulder is protruded from the Vulva, the back being nearly folded, and the knees turned up against the face.