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. mamertensis
    [Paralcidia mamertensis]
  8. mammillatum
    [Douvilleiceras mammillatum juv.]
  9. mammillatum
    [Douvilleiceras mammillatum]
  10. mammillatum
    [Douvilleiceras mammillatum juv.]
  11. mantelli
    [Lewesiceras mantelli]
  12. mantelli
    [Lewesiceras mantelli juv.]
  13. mantelli
    [Mantelliceras mantelli (M)]
  14. marcianus
    [Eopachydiscus marcianus]
  15. margae
    [Gauthiericeras margae]
  16. margae
    [Gauthiericeras margae]
  17. margae
    [Gauthiericeras margae (M)]
  18. margae
    [Gauthiericeras margae (M)]
  19. margae
    [Gauthiericeras margae (m)]
  20. margae
    [Gauthiericeras margae juv.]
  21. margaritatus
    [Amaltheus margaritatus forme gibbosus]
  22. margaritatus
    [Amaltheus margaritatus forme margaritatus]
  23. marginata
    [Sonninia (Euhoploceras) marginata morphe dominans (M)]
  24. marroti
    [Hoplitoplacenticeras marroti]
  25. martiusii
    [Vermisphinctes martiusii (M)]
  26. martiusii
    [Vermisphinctes martiusii (M)]
  27. marysae
    [Peltoceras marysae (M)]
  28. mascarellii
    [Heteroceras mascarellii]
  29. matheroni
    [Pseudohaploceras matheroni]
  30. matheroni
    [Pseudohaploceras cf. matheroni]
  31. matheronianum
    [Ancyloceras cf. matheronianum]
  32. matheronianum
    [Ancyloceras matheronianum]
  33. matheyi
    [Prososphinctes matheyi (m)]
  34. maugenesti
    [Acanthopleuroceras aff. maugenesti]
  35. maugenesti
    [Acanthopleuroceras maugenesti]
  36. maximus
    [Hamites (H.) cf. maximus]
  37. mayoriana
    [Puzosia (P.) mayoriana]
  38. mayoriana
    [Puzosia (P.) mayoriana]
  39. medea
    [Kosmoceras medea (M) juv.]
  40. meeki
    [Placenticeras meeki (M)]
  41. meniscum
    [Labyrinthoceras meniscum (M)]
  42. meriani
    [Acrioceras (A.) meriani]
  43. meseres
    [Prorsisphinctes aff. meseres]
  44. messiaeni
    [Quenstedtoceras messiaeni (M)]
  45. mexicanum
    [Phlycticeras mexicanum (M)]
  46. michalskii
    [Hecticoceras (Chanasia) aff. michalskii (M)]
  47. michelinianus
    [Protohoplites (P.) michelinianus]
  48. microstoma
    [Bullatimorphites (Kheraiceras) microstoma (m)]
  49. milletianus
    [Hypacanthoplites milletianus]
  50. mirabilis
    [Hoplitoides cf. mirabilis]
  51. mirabilis
    [Hoplitoides mirabilis]
  52. mirabilis
    [Hourcquia mirabilis]
  53. mite
    [Gaudryceras gr. mite]
  54. mollis
    [Mollistephanus mollis]
  55. monopujaae
    [Rugacrioceras monopujaae (m)]
  56. moorei
    [Dumortieria moorei]
  57. moriezense
    [Heteroceras moriezense]
  58. mouterdei
    [Bajocisphinctes mouterdei (M)]
  59. moutonianum
    [Moutoniceras moutonianum]
  60. mucronatus
    [Mucrodactylites mucronatus (m)]
  61. multicostatum
    [Coroniceras multicostatum]
  62. multiforme
    [Morphoceras multiforme (M)]
  63. munieri
    [Wrightoceras munieri]
  64. munieri
    [Wrightoceras munieri]
  65. munieri
    [Wrightoceras munieri]
  66. murchisonae
    [Ludwigia murchisonae (m)]
  67. murleyi
    [Hildaites murleyi]
  68. mutabile
    [Stephanoceras mutabile (M)]
  69. muticum
    [Metaderoceras gr. muticum]