(London, Taylor and Francis, 1862). 4to. No wrappers as extracted from "Philosophical Transactions" 1862 - Vol. 152 - Part I. Pp. 455-467 a. 7 lithographed plates. The plates with some soiling, dampstains and brownspots. Text fine and clean.
First printing of Owens importentr paper describing a genus of Dicynodonts that lived during the late Permian and Jurrasic periods. Dicynodonts meaning "two dog teeth" were pigike herbivorous with two large tusks in the upper jaw.