1. Jauberticeras
    [Jauberticeras jaubertianus]
  2. Jeletzkytes
    [Jeletzkytes nebrascensis (M)]
  3. Jeletzkytes
    [Jeletzkytes nebrascensis (m)]
  4. Jimboiceras
    [? Jimboiceras sp.]
  5. Jouaniceras
    [Jouaniceras (Jouaniceras) sicardi]