A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . nce connected with a system ofcanals distinct from the ordinary communications betweenthe chambers and the perforations of the shell-wall; amongimportant fossils are Fitsidina (E 96), Nonionina (0 11, 46,86, E 94, 96), Polystomella (0 45, E 93), Amphistegina(0 40, 98, E 97), Operculina (0 80, 88, R 98), Heterostegina(0 99, E 99, 100), Nummidites (0 87), and Orbitoides. Thecomplication of structure sometimes attained in this familymay be studied in an enlarged mode
A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . nce connected with a system ofcanals distinct from the ordinary communications betweenthe chambers and the perforations of the shell-wall; amongimportant fossils are Fitsidina (E 96), Nonionina (0 11, 46,86, E 94, 96), Polystomella (0 45, E 93), Amphistegina(0 40, 98, E 97), Operculina (0 80, 88, R 98), Heterostegina(0 99, E 99, 100), Nummidites (0 87), and Orbitoides. Thecomplication of structure sometimes attained in this familymay be studied in an enlarged model of a Nitmmulite. RoTALiiDAE—0, Eotolia, Lower Cretaceous to Becent; j), Truncatu-lina, Carboniferous to Recent. Nummulitidae—7, Archaediscus, Carboniferous ; s, Polystomella, Ju-rassic to Recent; t, Amphistegina, Carboniferous, and Tertiary toRecent. The Epoch mentioned after each genus is the oldest in which it isfound ; all, except Archaediscus, survive to the present. The figuresare variously enlarged, from 10 to 100 diameters. (From Nicholsons Palseontology, after H. B. Brady.) PROTOZOA—FORAMINIFERA. 21 Gallery Fig. 3.—Examples of Foraminifera :— MiLiOLiDAE—a, Cornuspira ; b, Qimiqiieloculina ; c, Peneroplis : all Tertiary to ^—d, Litiiola, Carboniferous to Eecent; e, Trochammina, Lower Lias to —/, Lagena; g, Nodosaria ; h, Marginulina : all Cambrian to Recent; i, Frondicularia, Permian to Recent; j, Polymorphina, Trias to —Globigerina, Cambrian to —I, Textularia, Cambrian to Recent; m, Cassidulina, Lower Cretaceous to Recent; n, Bulimina, Jurassic to Recent. 22 GUIDE TO THE FOSSIL INVEETEBEATE ANIMALS. Gallery X. The marine Foraminifera, with which geologists area _e^ease (.j^jg^y concerned, are found on sea-weed and similar objectson the sea-floor, from shore pools down to great depths, andfrom arctic to tropical waters, sometimes fixed and some-times free; they live chie
Size: 1285px × 1946px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbr, bookcentury1900, bookdecade1900, booksubjectfossils
