Extra ovaries have been found in different cases in the human female,
the additional organ being furnished with a fallopian tube, and in some
instances an extra uterine horn. No facts are at hand concerning the
lower animals, but the occurrence of gestation and the birth of a single
puppy a year after careful castration, would seem to suggest that the
condition occurs in the bitch. There is no embryological reason why the
lower animals should not at times show this deviation from the normal.