graptolites: 40, 84, 86 mammals: 100-107 reptiles: 89-100 _Cladochonus_: 51, 52 _Cladophyllia_: 53 clams: 11, 56, 59. _See also_ pelecypods. class, taxonomic: 22 classification, binomial nomenclature: 21-22 units of: 22 club mosses: 47 coal: 20, 47 mines: 20, 47 plants: 16, 46, 47, 48 _Cochlespiropsis_: 63 Coelenterata: 49, 51, 84 coelenterates: 49, 51-_53_ Coleoidea: 66 coleoids: 77, 78 collecting bags: 17, 18 columella, corals: 51 gastropods: 59, 60 columnal, crinoid: 81, 82, 83 Comanchean series of Cretaceous: 34. _See also_ Lower Cretaceous. compass: 19 _Composita subtilita_: 57 compound corals. _See_ corals, colonial. concretions: 16 coniferous trees: 7 conodonts: 41, 88, 89 _Conus_: 63 Cooper, G. A.: 2, 12 coprolites: 14 corallite: 49, 51 corallum: 51 corals: 11, 24, 26, 27, 49, 51, 52, 53 “button”: 49, 53 colonial: 24, 27, 30, 51, 52, 53 Cretaceous: 53 “horn”: 49, 51, 52 morphology: 51 Pennsylvanian: 52 polyp: 49 solitary: 24, 28, 29, 30, 49, 51, 52, 53 symmetry: 24, 26, 27, 28, 29, 30 Tertiary: 53 _Cordaites_: 48 correlation: 32 _Corythosaurus_: 90 cotylosaurs: 89, 92 crabs: 78, 79 _Crassatella_: 72 crayfish: 78 creodonts: 102 Cretaceous— _See also_ Comanchean and Gulf series. derivation and pronunciation: 34 fossils: 42-43 arthropods: 79 brachiopods: 56 cephalopods: 66, 67, 76, 77 corals: 53 crocodiles: 95, 96 dinosaurs: 90, 91, 93, 94, 95, 97, 99 echinoderms: 83, 84, 85 foraminifers: 49 gastropods: 59, 62 nautiloids: 76 pelecypods: 59, 66, 68-_71_ shark teeth: 88 worms: 78 tubes: 9 of central Texas, Edwards Plateau, Gulf Coastal Plain, High Plains, north Texas, and Trans-Pecos Texas: 42 “Pyrite Fossil Zone” of: 11 crinoidal limestone: 41, 82, 83 Crinoidea: 81 crinoids: 26, 28, 41, 81, 82, 83 calyx: 81, 82, 83 morphology: 81 stems: 26, 28, 81, 82, 83 Crockett County: 42 Crockett formation: 43 crocodiles: 95, 96 crossopterygians: 87 crustaceans: 79, 80 Culberson County: 35 cuttlefish: 78 cycads: 47, 48 _Cymatoceras_: 75, 76 Cystoidea: 81 cystoids: 81, 82, 83