Oolithes

Oolithes is an oogenus with uncertain affinities. It has historical significance because it was the earliest named oogenus. James Buckman described the first named species as "Oolithes bathonicae" in a communication to the 4 May 1859 meeting of the Geological Society (published in 1860). Buckman believed that "Oolithes" represented the eggs of a teleosaurian reptile.
Since Buckman's description of "O. bathonicae", two other oospecies have been named: "O. nanhsiungensis" and "O. spheroides", both of which were native to the Maastrichtian of China.