This happens, for instance, with the spiracle of many Elasmobranchs, which makes its appearance after the hyobranchial cleft, not before it as it should do, being anterior to it in position, and as it does in the amniota in which it shows no reduction in size as compared with the other pharyngeal clefts.
"Darwin and Modern Science"
A.C. Seward and Others
One of the most obvious examples of this is the allantois in the amniota.
"Hormones and Heredity"
J. T. Cunningham