He placed it in a unique family , Amphicoeliidae , though this is now considered a nomen oblitum ( forgotten name ) .
Edward Drinker Cope described his finds in two 1878 issues of the American Naturalist , and assigned them to the new genus Amphicoelias .
Edward Drinker Cope placed Amphicoelias in a unique family , Amphicoeliidae , though this is now considered a nomen oblitum ( forgotten name ) .
Edward Drinker Cope described his finds in two 1878 issues of the American Naturalist , and assigned them to the new genus Amphicoelias .