A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) ... / With 7 plates and 96 textfigures.

British Museum (Natural History). Department of Geology

Date:: 1911

Credit: A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) ... / With 7 plates and 96 textfigures. Source: Wellcome Collection.

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$Gallery J. E. Lee, and have been described l)y the Lev. G. F. Whid- borne in the IMonographs of the Falaeontographical Society. Here are most of the genera already observed in tlie Carboni- ferous series. Among lamellibranchs Cardiola retrostriatci is important to the stratigrapher. Table-case Silurian. The Ludlovian Age is represented by fossils from Ledbury, Ludlow, and Kendal, the Wenlockian by fossils from Dudley and Benthall Edge, the Valentian by a few Bellerophons from the Llandovery beds. In addition to the I’alaeozoic genera already mentioned, one may see here rtcrinaea (Fig. 75 h), Orthonota, and Grani7ni/sia among the common lamellibranchs. The gastropods include numerous forms allied to Euom'phalus, one of them, Foh/tropina, preser\ ing the operculum, also the slightly curved Eccnliom- phalus, and Trnnatonohis (Fig. 75/), the “ piercc'd back” ally of Bellerophon. The Amphineura are re})resented by Ifelmin/hochiton. Fig. 75.—Lower Palaeozoic Lamellibranchs and Gastropods, fl, Cardiola intcrrnpta; b, Pterinsea Danbyi; c, Bcllerophon cambriensis, a recon- structed side view; d, Plalyccras \^Acroculia'] haliotis; c, Maclurea Logani, the tjme-specimen; /, Trematonotus dilatatns. a, b,d, and /, are Silurian from the Wenlock beds of Dudley; c is Ordovician, hoin the lower Llandeilo of Ayrshire; c, Cambrian, from the Upper hestimog beds of Dolgelly. a and c are nat. size; b, d, e, f, natural size. (Table-case IG.) Table-case Ordovician. The rocks of this Epoch, formerly classed 16. as Lower Silurian, have furnished molluscan fossils from the Caradoc, Llandeilo, and Arenig divisions. Hiose e.xhibited$