The next chamber, the urodaeum, is small, and receives in its dorso-lateral wall the ureters and the genital ducts; above and below this chamber is closed by circular folds, the lower of which, towards the ventral side, passes into the coating of the copulatory organ when such is present.
The di-calcium salt, Ca2H2(P04)2, occurs in a concretionary form in the ureters and cloaca of the sturgeon, and also in guano.
The ureters open into the fundus of the bladder as in some Rodents.
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