1. macrescens
    [Morphoceras macrescens (M)]
  2. macrescens
    [Morphoceras macrescens (M)]
  3. magniforme
    [Iniskinites magniforme]
  4. majoricensis
    [Crioceratites majoricensis]
  5. malagasyense
    [Nostoceras (N.) malagasyense]
  6. malagma
    [Denckmannia gr. malagma]
  7. malbosi
    [Malbosiceras gr. malbosi]
  8. mammillatum
    [Douvilleiceras mammillatum]
  9. mammillatum
    [Douvilleiceras mammillatum juv.]
  10. mammillatum
    [Douvilleiceras mammillatum]
  11. mantelli
    [Lewesiceras mantelli]
  12. mantelli
    [Lewesiceras mantelli juv.]
  13. mantelli
    [Mantelliceras mantelli (M)]
  14. mantelli
    [Mantelliceras mantelli juv.]
  15. marcianus
    [Eopachydiscus marcianus]
  16. margae
    [Gauthiericeras margae]
  17. margaritatus
    [Amaltheus margaritatus (M)]
  18. marginata
    [Sonninia (Euhoploceras) marginata forme dominans (M)]
  19. martiusii
    [Vermisphinctes martiusii (M)]
  20. marysae
    [Peltoceras marysae (M)]
  21. mascarellii
    [Heteroceras mascarellii]
  22. matheroni
    [Pseudohaploceras matheroni]
  23. matheroni
    [Pseudohaploceras cf. matheroni]
  24. matheronianum
    [Ancyloceras (A.) cf. matheronianum]
  25. matheyi
    [Prososphinctes matheyi (m)]
  26. maugenesti
    [Acanthopleuroceras maugenesti]
  27. maximus
    [Hamites (H.) cf. maximus]
  28. mayoriana
    [Puzosia (P.) mayoriana]
  29. medea
    [Kosmoceras medea (M) juv.]
  30. meeki
    [Placenticeras meeki (M)]
  31. meriani
    [Acrioceras meriani]
  32. meseres
    [Prorsisphinctes aff. meseres]
  33. messiaeni
    [Quenstedtoceras messiaeni (M)]
  34. mexicanum
    [Phlycticeras mexicanum (M)]
  35. michalskii
    [Hecticoceras (Chanasia) aff. michalskii (M)]
  36. michelinianus
    [Protohoplites (P.) michelinianus]
  37. microstoma
    [Bullatimorphites (Kheraiceras) microstoma (m)]
  38. milletianus
    [Hypacanthoplites milletianus]
  39. mirabilis
    [Hoplitoides cf. mirabilis]
  40. mirabilis
    [Hoplitoides mirabilis]
  41. monopujaae
    [Rugacrioceras monopujaae (m)]
  42. moorei
    [Dumortieria moorei]
  43. moriezense
    [Heteroceras moriezense]
  44. moutonianum
    [Moutoniceras moutonianum]
  45. mucronatus
    [Mucrodactylites mucronatus (m)]
  46. multiforme
    [Morphoceras multiforme (M)]
  47. munieri
    [Wrightoceras munieri]
  48. munieri
    [Wrightoceras munieri]
  49. murchisonae
    [Ludwigia murchisonae (m)]
  50. murleyi
    [Hildaites murleyi]