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. mauryae
    [Tragodesmoceras mauryae]
  37. maximus
    [Hamites (H.) cf. maximus]
  38. mayoriana
    [Puzosia (P.) mayoriana]
  39. mayoriana
    [Puzosia (P.) mayoriana]
  40. medea
    [Kosmoceras medea (M) juv.]
  41. meeki
    [Placenticeras meeki (M)]
  42. meniscum
    [Labyrinthoceras meniscum (M)]
  43. meriani
    [Acrioceras (A.) meriani]
  44. meseres
    [Prorsisphinctes aff. meseres]
  45. messiaeni
    [Quenstedtoceras messiaeni (M)]
  46. mexicanum
    [Phlycticeras mexicanum (M)]
  47. michalskii
    [Hecticoceras (Chanasia) aff. michalskii (M)]
  48. michelinianus
    [Protohoplites (P.) michelinianus]
  49. microstoma
    [Bullatimorphites (Kheraiceras) microstoma (m)]
  50. milletianus
    [Hypacanthoplites milletianus]
  51. mirabilis
    [Hoplitoides cf. mirabilis]
  52. mirabilis
    [Hoplitoides mirabilis]
  53. mirabilis
    [Hourcquia mirabilis]
  54. mite
    [Gaudryceras gr. mite]
  55. mollis
    [Mollistephanus mollis]
  56. monopujaae
    [Rugacrioceras monopujaae (m)]
  57. moorei
    [Dumortieria moorei]
  58. moriezense
    [Heteroceras moriezense]
  59. mouterdei
    [Bajocisphinctes mouterdei (M)]
  60. moutonianum
    [Moutoniceras moutonianum]
  61. mucronatus
    [Mucrodactylites mucronatus (m)]
  62. multicostatum
    [Coroniceras multicostatum]
  63. multiforme
    [Morphoceras multiforme (M)]
  64. munieri
    [Wrightoceras munieri]
  65. munieri
    [Wrightoceras munieri]
  66. munieri
    [Wrightoceras munieri]
  67. murchisonae
    [Ludwigia murchisonae (m)]
  68. murleyi
    [Hildaites murleyi]
  69. mutabile
    [Stephanoceras mutabile (M)]
  70. muticum
    [Metaderoceras gr. muticum]