L labels, paper: 19 _laeviscula, Exogyra_: 70 Lamar State College of Technology: 1, 2, 27 lampreys: 87 _Latirus_: 63 Lee College: 27 _Lepidodendron_: 46 _Levifusus_: 64 _Lima_: 72 limonite: 11 _Lingula_: 55, 56 Linnaeus: 21 Linné: 21 _Linoproductus_: 57 _lisbonensis, Ostrea_: 72 liverworts: 44 lizards: 89 Llano uplift: 36, 37, 40, 41 Lonsdale, John T.: 1 lophophore, brachiopod: 54 _Lophophyllidium_: 49, 51, 52 _proliferum_: 52 _radicosum_: 52 Los Angeles, California: 5 Louisiana: 37 Lower Cretaceous: 34, 42, 56, 97. _See also_ Comanchean. _lugubris, Alectryonia_: 68 _Lunatia_: 62 lungfishes: 87 M Macon, J. W.: 2 magnifying glass: 17, 18 Malone Mountain: 42 Mammalia: 89, 100-107 mammoths: 102, 104, 107 frozen: 7, 102 tooth: 104 woolly: 102, 104, 107 mantle, brachiopod: 54 pelecypod: 59 maps— county: 17 geologic: 19 of Texas: 38-39 physiographic of Texas: 36 topographic: 19, 20 Marathon uplift: 35, 36, 40, 41 marcasite: 11 _Marginifera_: 57 _opima_: 12, 13 mastodon, tooth: 104 _Meandrostia_: 50 Mediterranean Sea: 3 _mercenaria, Venus_: 22 _Mesalia_: 63 _Mesolobus_: 57 Mesozoic— derivation and pronunciation: 33 periods of: 34 rocks in Texas: 42-43 metamorphic rocks: 5, 19 _Metoicoceras_: 76 _Michelinia_: 52 _Micrabacia_: 49, 52 microfossils: 4, 10, 32, 47, 49, 50, 78 micropaleontological slides: 32 micropaleontologist: 32, 47, 80 micropaleontology: 4, 89 Midwestern University: 27 mine dumps: 20, 47 Mississippian— derivation and pronunciation: 34 fossils: 41 blastoid: 81 brachiopods: 55 bryozoan: 54 of Hueco Mountains: 41 of Llano region: 41 mold, external: 9, 11, 59, 66 internal: 9, 11, 59, 62, 66 Mollusca: 56-78 mollusks: 7, 56, 59-78. _See also_ Mollusca. _Moropus_: 106 mosasaur: 91, 93, 95 “moss animals”: 54 mosses: 44 _Muirwoodia multistriatus_: 12, 13 multituberculates: 100 _multistriatus, Muirwoodia_: 12, 13 mussels: 56, 59 museums, as aid in identification: 23 American, Natural History: 2, 15, 96 Strecker: 95 Texas Memorial: 14, 87, 95, 97, 100, 102 _Myalina_: 67 _Mylodon_: 100, 101 N Nautiloidea: 66 nautiloids: 66 Cretaceous: 76 morphology: 75 Pennsylvanian: 76 sutures: 75 _Nautilus_: 66 morphology: 75 _Neithea_: 70 _Neospirifer_: 57 _cameratus_: 58 _Nerinea_: 62 _Neuropteris_: 48 _Neverita_: 64 New Mexico: 7 New York City: 14 North-Central Plains: 35, 36, 37, 40, 41, 42, 43 north Texas: 42 North Texas State College: 27 notebook, field: 17 _Notopocorystes_: 79, 80 _Nucula_: 73 _Nuculana_: 67 _Nuculopsis_: 67