The name of the young girl is Ursula.
(She has been stored in Bellmer's memory.)
Bellmer locates himself in his sexual fantasy.
He sneaks in her body, superimposing himself and her,
and sticks his DESIRE out of her slit.
Alternatively, we can say also as follows.
The figure we are looking at is an androgyny
produced by the inversion of the portion of Bellmer's body
that should be out of Ursula's body
and the other portion that should be in her body.