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