They virtually lived separate lives, as one might be asleep while the
other cried, etc.

CLASS V.--While instances of ischiopagi are quite numerous, few have
attained any age, and, necessarily, little notoriety. Pare speaks of
twins united at the pelves, who were born in Paris July 20, 1570. They
were baptized, and named Louis and Louise. Their parents were well
known in the rue des Gravelliers. According to Bateman, and also Rueff,
in the year 1552 there were born, not far from Oxford, female twins,
who, from the description given, were doubtless of the ischiopagus
type. They seldom wept, and one was of a cheerful disposition, while
the other was heavy and drowsy, sleeping continually. They only lived a
short time, one expiring a day before the other. Licetus speaks of Mrs.
John Waterman, a resident of Fishertown, near Salisbury, England, who
gave birth to a double female monster on October 26, 1664, which
evidently from the description was joined by the ischii. It did not
nurse, but took food by both the mouths; all its actions were done in
concert; it was possessed of one set of genitourinary organs; it only
lived a short while. Many people in the region flocked to see the
wonderful child, whom Licetus called "Monstrum Anglicum." It is said
that at the same accouchement the birth of this monster was followed by
the birth of a well-formed female child, who survived.
Geoffroy-Saint-Hilaire quotes a description of twins who were born in
France on October 7, 1838, symmetrically formed and united at their
ischii. One was christened Marie-Louise, and the other
Hortense-Honorine. Their avaricious parents took the children to Paris
for exhibition, the exposures of which soon sacrificed their lives. In
the year 1841 there was born in the island of Ceylon, of native
parents, a monstrous child that was soon brought to Columbo, where it
lived only two months. It had two heads and seemed to have duplication
in all its parts except the anus and male generative organs.
Montgomery speaks of a double child born in County Roscommon, Ireland,
on the 24th of July, 1827. It had two heads, two chests with arms
complete, two abdominal and pelvic cavities united end to end, and four
legs, placed two on either side. It had only one anus, which was
situated between the thighs. One of the twins was dark haired and was
baptized Mary, while the other was a blonde and was named Catherine.
These twins felt and acted independently of each other;