structure of;
  Crinoidal; Foraminiferal; coralline; magnesian; metamorphic;
  oolitic; pisolitic; bituminous; Laurentian.
Limnoea; pyramidalis.
Limulus.
Lingula; Credneri. 
Lingula Flags.
Lingulella; Davisii; ferruginea.
Liriodendron; Meeki.
Lithostrotion; irregulare.
Lituites. 
Lizards (see Lacertilia). 
Llama. 
Llanberis Slates. 
Llandeilo rocks. 
Llandovery rocks; Lower; Upper. 
Lobsters. 
Loess. 
London Clay. 
Longmynd rocks.
Lonsdaleia.
Lophiodon.
Lophophyllum. 
Lower Cambrian; Chalk; Cretaceous; Devonian; Eocene; Greensand;
  Helderberg; Laurentian rocks; Ludlow rock; Miocene; Old Red
  Sandstone; Oolites; Silurian period; rocks of, in Britain; in
  North America; life of.
Loxonema. 
Ludlow rock.
Lycopodiaceoe. 
Lynton Group.
Lyrodesma.

Macaques. Machoeracanthus major. Machairodus; cultridens. Maclurea; crenulata. Macrocheilus. Macropetalichthys; Sullivanti. Macrotherium giganteum. Macrurous Crustaceans. Mactra.  Maestricht Chalk.  Magnesian Limestone; nature and structure of; of the Permian
  series. 
Magnolia. Mammalia, of the Trias; of the Jurassic; of the Eocene; of
  the Miocene; of the Pliocene; of the Post-Pliocene. 
Mammoth.  Man, remains of, in Post-Pliocene deposits.  Manatee. Mantellia; megalophylla.  Maple.  Marble; encrinital; statuary.  Marcellus Shales. Mariacrinus.  Marmots.  Marsupials; of the Trias; of the Jurassic; of the Eocene; of
  the Miocene; of the Post-Pliocene.
Marsupiocrinus. Marsupites. Mastodon; Americanus, angustidens; Arvenensis; longirostris;
  Ohioticus; Sivalensis. 
Medina Sandstone. Megalichthys. Megalodon. Megalomus. Megalonyx. Megalosaurus. Megatherium; Cuvieri. Melania. Melonites.  Menevian Group. Menobranchus. Meristella; cylindrica; intermedia; naviformis. Mesopithecus.  Mesozoic Period. Michelinia. Micraster. Microlestes; antiquus.  Middle Devonian; Eocene; Oolites; Silurian.  Miliolite Limestone. Millepora.  Millstone Grit.  Miocene period; rocks of, in Britain; in France; in Belgium;
  in Switzerland; in Austria; in Germany; in Italy; in India;
  in North America; life of. 
Mitre-shells. Mitra.  Moas of New Zealand. Modiolopsis; Solvensis.  Molasse.  Mole.  Monkeys.  Monocotyledonous plant. Monograptus; priodon. Monotis.  Monte Bolca, fishes of. Montlivaltia.  Mosasauroids. Mosasaurus; Camperi; princeps.  Mountain Limestone.  Mud-fishes.  Mud-turtles.  Mull, Miocene strata of. Murchisonia; gracilis. Murex.  Muschelkalk.  Musk-deer.  Musk-ox.  Musk-sheep. Myliobatis Edwardsii_. Mylodon; robustus. Myophoria; lineata. Myriapoda of the Coal.