The second group of the double autositic monsters are _Terata Anadidyma_--terata divided from below upward. The first genus is the _Dipygus_. This has a single body above, but a double pelvis with double lower extremities in the typical cases. There is an exact description of a double monster of this kind in the Gaelic _Annals of the Four Masters_ as early as the year 727 of this era. The chronicler says in that year on Dalkey Island near Dublin, "There was a cow seen which had one head and one body as far as her shoulders, two bodies from her shoulders hindward, and two tails. She had eight legs, and she was milked three times a day." A perfect human Dipygus with two equally developed pairs of legs is unknown. Catherine Kaufmann, who was born in 1876, and who died in 1878, had a double pelvis with double pelvic organs in part, but she had only one pair of legs. There is a similar anomaly said to be living in Philadelphia at present. Blanche Dumas, born in 1860, had a double pelvis, double pelvic organs, and three legs. Mrs. B., born in 1868, {84} had four legs--the two inner ones were smaller than the outer pair. Her spinal column was divided up to the third lumbar vertebra. Her double pelvic organs acted independently. There are living male examples of this form of monster. The next genus is the _Syncephalus_, called also _Janus_ and _Janiceps_. Its lower body is double up to the umbilicus, the trunk single above that point; the head shows signs of doubling, and there are four legs and four arms; the bodies grow front to front. The head usually is large, therefore this monster is born dead. Another genus is the _Craniopagus_--twins joined only by the skull or scalp. There are three species, named from the place of union--_Craniopagus Frontalis, C. Parietalis_, and _C. Occipitalis_. A third group of double autositic monsters are the _Terata Anakatadidyma_, which are divided above and below, but joined from the navel to the head. There are three genera. The first, the _Prosopothoracopagus_, is joined at the upper abdomen, the chest, and the faces; the spinal columns are separate. The faces are imperfect, the jaws are united; there is a broad neck with one oesophagus, and there is one stomach and one duodenum. This is a rare form, and it can not exist out of the uterus. A second genus, the _Thoracopagus_, has a thorax in common, and the inner legs may be united. It is, as a rule, still-born. The next genus is the _Omphalopagus_, in which the twins are joined from the navel to the bottom of the chest. This double monster has the slightest union of all, and it is very rare. The Siamese Twins were omphalopagi. They quarrelled; one became a drunkard and the other remained temperate. They married two women, and Chang had ten children, and Eng twelve. Chang died while Eng was asleep, and the latter died two hours after he had waked and learned of his brother's death.