Allen describes an elongated kidney with two ureters.
Coeyne mentions duplication of the ureters on both sides.

Lediberder reports a case in which the ureter had double origin.

Tyson cites an instance of four ureters in an infant.

Penrose mentions the absence of the upper two-thirds of the left ureter, with a small cystic kidney, and there are parallel cases on record.
The ureters sometimes have anomalous terminations either in the rectum, vagina, or directly in the urethra.

This latter disposition is realized normally in a number of animals and causes the incessant flow of urine, resulting in a serious inconvenience.