1. jacquoti
    [Pachydiscus (P.) jacquoti jacquoti]
  2. jamesoni
    [Uptonia jamesoni (M)]
  3. janus
    [Distichoceras (Geminites) janus (M)]
  4. japonicum
    [Eubostrychoceras (E.) japonicum]
  5. japonicus
    [Kitchinites japonicus]
  6. japonicus
    [Pachydiscus (Neodesmoceras) japonicus]
  7. jason
    [Kosmoceras jason (M)]
  8. jason
    [Kosmoceras jason (M)]
  9. jauberti
    [Jauberticeras jauberti]
  10. jeannoti
    [Olcostephanus (Jeannoticeras) jeannoti]
  11. jelevi
    [Leptoceras jelevi]
  12. jugosa
    [Haugia jugosa]
  13. jukesbrownei
    [Acanthoceras jukesbrownei]
  14. jurense
    [Perilytoceras jurense]